Update 8756 server: fix NPE of unit test passEncRootPlannerHostSupportingEncryptionTest

Author: weizhouapache

server/src/main/java/com/cloud/deploy/DeploymentPlanningManagerImpl.java

@@ -2017,7 +2017,7 @@ public boolean postStateTransitionEvent(StateMachine2.Transition<State, Event> t
     }
 
     public static String logDeploymentWithoutException(VirtualMachine vm, DeploymentPlan plan, ExcludeList avoids, DeploymentPlanner planner) {
-        return LogUtils.logGsonWithoutException("Trying to deploy VM [%s] and details: Plan [%s]; avoid list [%s] and planner: [%s].", vm, plan, avoids, planner);
+        return LogUtils.logGsonWithoutException("Trying to deploy VM [%s] and details: Plan [%s]; avoid list [%s] and planner: [%s].", vm, plan, avoids, planner != null ? planner.getName() : null);
     }
     @Override
     public ConfigKey<?>[] getConfigKeys() {