New set modifier so that set only assigns a value when variable is not defined.
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                 Key: VELOCITY-619
                 URL: https://issues.apache.org/jira/browse/VELOCITY-619
             Project: Velocity
          Issue Type: Improvement
          Components: Engine
            Reporter: Byron Foster


Define a new #set modifier such that a variable is only set if it is not 
defined, like so:

#set($!foo = "bar")

If the '!' character proceeds the variable foo, then $foo will be set with the 
value of "bar" ONLY IF $foo is not defined (is not in the context).  Otherwise 
if $foo is defined it will remain unchanged.





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