Add protection for empty CSCCluster fit results

In the trigger we can run into the case where we have some empty CSC clusters which is resulting in empty CSCCluster fit results, so adding some protection to avoid accessing these empty fit results. Fixes ATR-22055.

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 2d90c3cb)

	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 20648]

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

merged

mentioned in commit a742b7dc

added sweep:ignore label

This change doesn't make sense &results[0] cannot be null and it is preventing the clang nightly from compiling.

Sorry, let me try to fix this in a better way then. It should be the case that results always exists, but it may be empty (ie results[0] may not exist if we have no strips here: https://gitlab.cern.ch/atlas/athena/-/blob/master/MuonSpectrometer/MuonReconstruction/MuonDataPrep/CscClusterization/src/QratCscClusterFitter.cxx#L361).

if the vectors are empty do

if(results.empty() ||results0.empty()){

thanks

mentioned in commit sshaw/athena@652bc88b

mentioned in merge request !36615 (merged)