When updating a cicurlar TTree, do not dereference null pointer (happens in some cases of branches without data that are part of an object hierarchy).  This fixes https://savannah.cern.ch/bugs/?93282
When updating a cicurlar TTree, do not dereference null pointer (happens in some cases of branches without data that are part of an object hierarchy).  This fixes https://savannah.cern.ch/bugs/?93282


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@43607 27541ba8-7e3a-0410-8455-c3a389f83636

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