org.apache.velocity.app.event.implement.EscapeReference needs a guard against 
NPE
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         Key: VELOCITY-411
         URL: http://issues.apache.org/jira/browse/VELOCITY-411
     Project: Velocity
        Type: Bug
  Components: Source  
    Reporter: Konstantin Pribluda
     Fix For: 1.5


If reference value passed to EscapeReference.referenceInsert(String reference, 
Object value)  is null,
then derived clases produce NPE  when trying to do toString()

This condition shall be guarded like this: ( insert it on line 86 - too trivial 
for a patch ) 
        if(value == null) 
                return value;


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