[ROOT] TBranchClone with no directory fails

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Hi. I've got a TTree which I wish to associate with no directory.
This works fine according to the documentation for TTree:
tree.SetDirectory(0);

However, this fails if I wish to create a TBranchClones branch for
the tree with split level = 1because TBranchClones looks for a
file associated with the directory.

TTree* tree = new TTree("myName","My title");
tree->SetDirectory(0);
TBranch* branch = tree->Branch("someName",&someClonesArray,64000,1);

This goes through TREE_Tree.cxx line 599 to TREE_BranchClones.cxx
line 79 which calls:
79            TFile *bfile = gTree->GetDirectory()->GetFile();

and SEGV's because GetDirectory() returns zero.

-Gene Van Buren

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