MuonClusterOnTrackCreator: Fix clang warings.

Fix test for missing fit results.

This merge request affects 1 package:

• MuonSpectrometer/MuonReconstruction/MuonRIO_OnTrackCreators/MuonClusterOnTrackCreator

Adding @goetz ,@rosati ,@nkoehler ,@wleight as watchers

added MuonSpectrometer master review-pending-level-1 labels

CI Result SUCCESS (hash 1fb411d5)

	Athena	AthSimulation	AthGeneration	AnalysisBase
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
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 20926]

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

mentioned in commit a8d52e88

merged

added sweep:ignore label