RootConversions: Use WithRootErrorHandler.

Use WithRootErrorHandler to change the root error handler, for better thread-safety.

See ATEAM-715.

This merge request affects 1 package:

• Database/AthenaPOOL/RootConversions

This merge request affects 2 files:

• Database/AthenaPOOL/RootConversions/RootConversions/TConvertingStreamerInfo.h
• Database/AthenaPOOL/RootConversions/src/TConvertingStreamerInfo.cxx

Adding @mnowak ,@ssnyder as watchers

added Database master review-pending-level-1 labels

CI Result SUCCESS (hash 55e71043)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 30074]

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit d0163da9

added sweep:ignore label