yasserzamani opened a new pull request #439:
URL: https://github.com/apache/struts/pull/439


   There was a bug with AliasInterceptor not handling the Parameter.Empty that 
is returned from HttpParameters.get(). Since HttpParameters.get() always 
returns a non-null value, the Evaluated object is treated as always being 
defined, which results in the empty value being set incorrectly on the stack.


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