Update vca_vapp.py (#19562)

Check result of vApp creation and return module failure if creation task not present

lib/ansible/modules/cloud/vmware/vca_vapp.py

@@ -189,6 +189,9 @@ def create(module):
                                   catalog_name, network_name, network_mode,
                                   vm_name, vm_cpus, vm_memory, deploy, poweron)
 
+    if task is False:
+        module.fail('Failed to create vapp: ' + vapp_name)
+        
     module.vca.block_until_completed(task)
 
 def delete(module):