Update per comments

examples/tv-app/linux/README.md

@@ -107,6 +107,13 @@ id):
     $ app add 9050 (vendor id 9050)
     $ app remove 1
 
+
+You can also install or uninstall the app by using commands:
+
+    $ app install 65521 32768
+    $ app uninstall 65521 32768
+
+
 As an app platform, local apps can be used to facilitate commissioning using
 their AccountLogin clusters. The dummy apps have hardcoded setup codes - on a
 real device, these apps would communicate with a cloud service to obtain the

examples/tv-app/tv-common/src/AppTv.cpp

@@ -55,8 +55,6 @@ using namespace chip::AppPlatform;
 using namespace chip::app::Clusters;
 using namespace chip::Protocols::UserDirectedCommissioning;
 
-ContentAppFactoryImpl gFactory;
-
 #if CHIP_DEVICE_CONFIG_ENABLE_BOTH_COMMISSIONER_AND_COMMISSIONEE
 class MyUserPrompter : public UserPrompter
 {
@@ -288,6 +286,7 @@ MyPostCommissioningListener gMyPostCommissioningListener;
 #endif // CHIP_DEVICE_CONFIG_ENABLE_BOTH_COMMISSIONER_AND_COMMISSIONEE
 
 #if CHIP_DEVICE_CONFIG_APP_PLATFORM_ENABLED
+ContentAppFactoryImpl gFactory;
 
 ContentAppFactoryImpl * GetContentAppFactoryImpl()
 {

src/controller/CommissionerDiscoveryController.cpp

@@ -220,6 +220,12 @@ void CommissionerDiscoveryController::InternalOk()
         return;
     }
 
+    if (mAppInstallationService == nullptr)
+    {
+        ChipLogError(AppServer, "UX InternalOk: no app installation service");
+        return; 
+    }
+
     if (!mAppInstallationService->LookupTargetContentApp(client->GetVendorId(), client->GetProductId())) {
         ChipLogDetail(AppServer, "UX InternalOk: app not installed.");