MuonMM_CnvTools+MuonSTGC_CnvTools: Fix clang warnings.

Unchecked Statuscode.

This merge request affects 2 packages:

• MuonSpectrometer/MuonCnv/MuonMM_CnvTools
• MuonSpectrometer/MuonCnv/MuonSTGC_CnvTools

Affected files list will not be printed in this case

Adding @rosati ,@wleight ,@stavrop ,@jojungge ,@egodden as watchers

added MuonSpectrometer master review-pending-level-1 labels

CI Result SUCCESS (hash d5e0e165)

	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 40270]

Approving -- L1

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

mentioned in commit f2873014

merged

added sweep:ignore label