MongoDB SSLAwareMongoClient: Use isEmpty method instead of checking f…

…or ""

Signed-off-by: Andrea Cosentino <ancosen@gmail.com>

library/camel-kamelets-utils/src/main/java/org/apache/camel/kamelets/utils/mongodb/SslAwareMongoClient.java

@@ -67,7 +67,7 @@ public void checkServerTrusted(X509Certificate[] arg0, String arg1)
         public MongoClient get() {
             String credentials = username == null ? "" : username;
 
-            if (!credentials.equals("")) {
+            if (!credentials.isEmpty()) {
                 credentials += password == null ? "@" : ":" + password + "@";
             }