CLOUDSTACK-9208: Assertion Error in VM_POWER_STATE handler- Fixed

Author: jayapalu

engine/orchestration/src/com/cloud/vm/VirtualMachineManagerImpl.java

@@ -1280,7 +1280,10 @@ protected boolean sendStop(final VirtualMachineGuru guru, final VirtualMachinePr
         final VirtualMachine vm = profile.getVirtualMachine();
         final StopCommand stop = new StopCommand(vm, getExecuteInSequence(vm.getHypervisorType()), checkBeforeCleanup);
         try {
-            final Answer answer = _agentMgr.send(vm.getHostId(), stop);
+            Answer answer = null;
+            if(vm.getHostId() != null) {
+                answer = _agentMgr.send(vm.getHostId(), stop);
+            }
             if (answer != null && answer instanceof StopAnswer) {
                 final StopAnswer stopAns = (StopAnswer)answer;
                 if (vm.getType() == VirtualMachine.Type.User) {