MuonTrackFinderTools+ReweightUtils+METUtilities: fix gcc11 warnings

Fix potential null pointer dereference. Check result of dynamic_cast before dereferencing.

This merge request affects 3 packages:

• MuonSpectrometer/MuonReconstruction/MuonTrackMakers/MuonTrackMakerTools/MuonTrackFinderTools
• PhysicsAnalysis/AnalysisCommon/ReweightUtils
• Reconstruction/MET/METUtilities

Affected files list will not be printed in this case

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

added Analysis JetEtmiss MuonSpectrometer Reconstruction master review-pending-level-1 labels

CI Result SUCCESS (hash 94805f62)

	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 25348]

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

changed title from MuonTrackFinderTools+ReweightUtils+METUtilities: to MuonTrackFinderTools+ReweightUtils+METUtilities: fix gcc11 warnings

merged

mentioned in commit 3ff9f564

added sweep:ignore label