Allow #set to accept nulls as the right hand side argument.  
For backwards compatibility, this feature is turned off
by default.  Set the property "directive.set.null.allowed" to "true"
to permit this.  Thanks to the various contributors of issue
VELOCITY-186, including Thomas Veith who provided the patch 
and numerous others who contributed thoughts and comments.


git-svn-id: https://svn.apache.org/repos/asf/jakarta/velocity/core/trunk@332946 13f79535-47bb-0310-9956-ffa450edef68
10 files changed