NavigationHandler: navigation to non-exixtent view after ViewExpired
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                 Key: MYFACES-3189
                 URL: https://issues.apache.org/jira/browse/MYFACES-3189
             Project: MyFaces Core
          Issue Type: Bug
    Affects Versions: 2.0.8-SNAPSHOT, 2.1.2-SNAPSHOT
            Reporter: Martin Kočí


see 
http://weblogs.java.net/blog/edburns/archive/2009/09/03/dealing-gracefully-viewexpiredexception-jsf2

If user provides non-existent viewId, NPE occurs: MYFACES-3188

navigation in this situation leads to facesContext.viewRoot = null. I don't 
know what spec says about it but mojarra stays on current view in this case 
(navigate?) - on that view, where VVE is. 

We should also provide a warning about this situation.



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