Improve logging and exception handling for UILeaf
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                 Key: MYFACES-3258
                 URL: https://issues.apache.org/jira/browse/MYFACES-3258
             Project: MyFaces Core
          Issue Type: Sub-task
            Reporter: Martin Kočí
            Assignee: Martin Kočí
            Priority: Minor


If #{} (without a component tag) throws a exception (mainly in render 
response), it is practically impossible for user to find out which element was 
the source.

Suggestions:
* use Location and TagAttributeAware EL context wrappers from  MYFACES-3202 in 
ELText
* put UIComponent.VIEW_LOCATION_KEY into UILeaf during VDL.buildView
* improve toString for UIInstructions (output sometimes spans over three or 
more lines)


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