In the TChainIndex constructor, add a protection: if an index already exists, we must check if major/minorname correspond to the major/minor names in this function call.
In the TChainIndex constructor, add a protection:
if an index already exists, we must check if major/minorname correspond
to the major/minor names in this function call.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@22243 27541ba8-7e3a-0410-8455-c3a389f83636

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