Posibility to configure ReportInvalidReferences to don't report report 
variables,properties and method which exist, but only have null value
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                 Key: VELOCITY-553
                 URL: https://issues.apache.org/jira/browse/VELOCITY-553
             Project: Velocity
          Issue Type: Improvement
          Components: Engine
    Affects Versions: 1.5
         Environment: any
            Reporter: Tomáš Procházka


ReportInvalidReferences has very big imperfection, it report by default all 
variables, properties and method which has null value.
This may cause many problems for developer.

I for example need only validate template without any data, only check which 
contain right variables, properties or method (which exist), it's value is not 
important for me.

I tried use my own ReferenceInsertionEventHandler for replace null value with 
"" (empty String) but Velocity call InvalidReference handler before 
ReferenceInsertionEventHandler.

I suggest configuration options for this (repor or doesn't report null value)

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