CA merging GaudiConfig2 fixes
I found I had to make a number of changes to make merging of sequences with many shared components work again (specifically, these are the non-jet-specific bugfixes that were needed for JetRecConfig/share/JetRecTestCfg.py
to run).
The changes in AtlasSemantics
were needed because there were ToolHandles that were set to empty i.e. '', which caused merging to fail.
Edited by Teng Jian Khoo