Modify TBranchElement::Unroll to recover in case a branch cannot be split. A new branch is created in non-split mode. This situation may happen when a class inside a class derives from an abstract base class (eg all TArray classes).
Modify TBranchElement::Unroll to recover in case a branch cannot be split.
A new branch is created in non-split mode.
This situation may happen when a class inside a class derives from an abstract
base class (eg all TArray classes).


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@2511 27541ba8-7e3a-0410-8455-c3a389f83636

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