Support the case where the default size for the Cache is 0 and hence no cache is created. This can happen whenever the AutoFlush mechanism is explicitly disabled when create the TTree
Support the case where the default size for the Cache is 0 and hence no cache is created. This can happen whenever the AutoFlush mechanism is explicitly disabled when create the TTree


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@39576 27541ba8-7e3a-0410-8455-c3a389f83636

bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT