[Bug report] NullPointerException after alter operation

[TEOTEO520]

Version

main branch

Describe what's wrong

API:
/api//metalakes/metalake01/catalogs/kafkaCatalog01/schemas/default/topics/xxxxxx

Reason:
Due to the cancellation of the operation to reload the topic to fill in its other properties after the alter operation in #3729, there is a risk that the value of the downstream property may return null, which in turn could trigger a NullPointerException in the properties() method of the Topic class.
The specific code that triggers the NullPointerException is:
@Override public Map<String, String> properties() { return topic.properties().entrySet().stream() .filter(p -> !hiddenProperties.contains(p.getKey())) .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)); }

Error message and/or stacktrace

stackTrace
{
"code": 1002,
"type": "RuntimeException",
"message": "Failed to operate object [xxxxxx] operation [ALTER] under [default], reason []",
"stack": [
"java.lang.NullPointerException",
"\tat java.util.HashMap.merge(HashMap.java:1225)",
"\tat java.util.stream.Collectors.lambda$toMap$58(Collectors.java:1320)",
"\tat java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)",
"\tat java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)",
"\tat java.util.HashMap$EntrySpliterator.forEachRemaining(HashMap.java:1696)",
"\tat java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)",
"\tat java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)",
"\tat java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)",
"\tat java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)",
"\tat java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)",
"\tat org.apache.gravitino.catalog.EntityCombinedTopic.properties(EntityCombinedTopic.java:87)",
"\tat org.apache.gravitino.listener.api.info.TopicInfo.(TopicInfo.java:43)",
"\tat org.apache.gravitino.listener.TopicEventDispatcher.alterTopic(TopicEventDispatcher.java:80)",
"\tat org.apache.gravitino.bili.onemeta.rest.TopicOperations.lambda$alterTopic$5(TopicOperations.java:195)",
"\tat org.apache.gravitino.lock.TreeLockUtils.doWithTreeLock(TreeLockUtils.java:49)",
"\tat org.apache.gravitino.bili.onemeta.rest.TopicOperations.lambda$alterTopic$6(TopicOperations.java:192)",
"\tat java.security.AccessController.doPrivileged(Native Method)",
"\tat javax.security.auth.Subject.doAs(Subject.java:422)",
"\tat org.apache.gravitino.utils.PrincipalUtils.doAs(PrincipalUtils.java:39)",
"\tat org.apache.gravitino.server.web.Utils.doAs(Utils.java:188)",
"\tat org.apache.gravitino.bili.onemeta.rest.TopicOperations.alterTopic(TopicOperations.java:180)",
"\tat sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)",
"\tat sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)",
"\tat sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)",
"\tat java.lang.reflect.Method.invoke(Method.java:498)",
"\tat org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:52)",
"\tat org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:146)",
"\tat org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:189)",
"\tat org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:176)",
"\tat org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:93)",
"\tat org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:478)",
"\tat org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:400)",
"\tat org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:81)",
"\tat org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:256)",
"\tat org.glassfish.jersey.internal.Errors$1.call(Errors.java:248)",
"\tat org.glassfish.jersey.internal.Errors$1.call(Errors.java:244)",
"\tat org.glassfish.jersey.internal.Errors.process(Errors.java:292)",
"\tat org.glassfish.jersey.internal.Errors.process(Errors.java:274)",
"\tat org.glassfish.jersey.internal.Errors.process(Errors.java:244)",
"\tat org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265)",
"\tat org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:235)",
"\tat org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:684)",
"\tat org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:394)",
"\tat org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346)",
"\tat org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:358)",
"\tat org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:311)",
"\tat org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205)",
"\tat org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799)",
"\tat org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1656)",
"\tat org.apache.gravitino.server.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:91)",
"\tat org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)",
"\tat org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1626)",
"\tat org.apache.gravitino.server.web.VersioningFilter.doFilter(VersioningFilter.java:123)",
"\tat org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)",
"\tat org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1626)",
"\tat org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:552)",
"\tat org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)",
"\tat org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:600)",
"\tat org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)",
"\tat org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)",
"\tat org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)",
"\tat org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)",
"\tat org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1440)",
"\tat org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)",
"\tat org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:505)",
"\tat org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594)",
"\tat org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)",
"\tat org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1355)",
"\tat org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)",
"\tat org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146)",
"\tat org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)",
"\tat org.eclipse.jetty.server.Server.handle(Server.java:516)",
"\tat org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:487)",
"\tat org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:732)",
"\tat org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:479)",
"\tat org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277)",
"\tat org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)",
"\tat org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)",
"\tat org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)",
"\tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338)",
"\tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315)",
"\tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173)",
"\tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)",
"\tat org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:409)",
"\tat org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883)",
"\tat org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034)",
"\tat java.lang.Thread.run(Thread.java:748)"
]
}

How to reproduce

When initializing the Topic Table class object, put the key -> null into it.

Additional context

No response