Avoid segmentation fault when the 1st entry do not have any element in a collection and that we are trying to Draw/Scan a TClonesArray nested in that collection.
Avoid segmentation fault when the 1st entry do not have any element in a collection and that we are trying to Draw/Scan a TClonesArray nested in that collection.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@41949 27541ba8-7e3a-0410-8455-c3a389f83636

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