From Victor: TFile::Open() can return 0, adjust tests accordingly.
From Victor:
TFile::Open() can return 0, adjust tests accordingly.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@8747 27541ba8-7e3a-0410-8455-c3a389f83636

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