NPE in org.apache.myfaces.lifecycle.RenderResponseExecutor.execute
------------------------------------------------------------------

                 Key: MYFACES-3188
                 URL: https://issues.apache.org/jira/browse/MYFACES-3188
             Project: MyFaces Core
          Issue Type: Bug
    Affects Versions: 2.0.8-SNAPSHOT, 2.1.2-SNAPSHOT
            Reporter: Martin Kočí
            Priority: Minor


Caused by: java.lang.NullPointerException
        at 
org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:60)
        at 
org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:239)

NPE ocurres in situation:
1) ViewExpiredException
2) Navigate to viewExpired.xhtml in ExpcetionHandler
3) but viewExpired.xhtml does not exists as resource


(In previous situation, navigationHandler should stay on current view (mojarra 
does it) - I'll create separate issue for that.)

improve RenderResponseExecutor: provide useful log instead of cryptic NPE.

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