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whitlocb authored
I fixed MapNode merging so parallel engines can also send back histogram data. I also added a check for empty histogram data in the filter before we assume that we have it. This gets several more parallel tests to pass. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@6021 18c085ea-50e0-402c-830e-de6fd14e8384
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