Protect TTree::GetCurrentFile in case the current directory is gROOT. This case may happen when a TChain calls TChain::Process and no files have been connected to the chain yet, but a TFile has been opened meanwhile.
Protect TTree::GetCurrentFile in case the current directory is gROOT.
This case may happen when a TChain calls TChain::Process and no files have been
connected to the chain yet, but a TFile has been opened meanwhile.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@23171 27541ba8-7e3a-0410-8455-c3a389f83636

dawehner/root,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,dawehner/root,dawehner/root,dawehner/root,dawehner/root,dawehner/root,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,dawehner/root,dawehner/root,bbannier/ROOT