MakeProxy: Detect need for nested proxy based on having sub-branches rather than just the branch name ending in a period.
MakeProxy: Detect need for nested proxy based on having sub-branches rather than just the branch name ending in a period.

This problem was reported in ROOT-8585

tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot