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sankhesh authored
While deleting a node, there could be a reference dangling in the tree view that needs can cause issues. Check if the node being worked on is present in the MRML scene before referencing to it. Fixes issue 2841 git-svn-id: http://svn.slicer.org/Slicer4/trunk@21529 3bd1e089-480b-0410-8dfb-8563597acbee
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