Fix MuonTriggerEfficiencyScaleFactorAlg after systematics changes

Fix MuonTriggerEfficiencyScaleFactorAlg after systematics changes. It supports not writing out specific decorations and adds missing initialisations of read handles.

/cc @krumnack @jburr @mmuskinj

added bugfix + 1 deleted label

This merge request affects 1 package:

• PhysicsAnalysis/Algorithms/MuonAnalysisAlgorithms

This merge request affects 1 file:

• PhysicsAnalysis/Algorithms/MuonAnalysisAlgorithms/Root/MuonTriggerEfficiencyScaleFactorAlg.cxx

Adding @krumnack ,@tadej ,@pagessin as watchers

added 21.2 Analysis Trigger analysis-review-required review-pending-level-1 labels

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CI Result SUCCESS (hash d70aec4e)

	AnalysisBase	AthAnalysis
externals
cmake
make
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AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 40168]

lgtm -- L1

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

CI Result SUCCESS (hash d70aec4e)

	AthDerivation
externals
cmake
make
required tests
optional tests

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AthDerivation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-GCC62-CC7 1096]

changed the description

merged

mentioned in commit 890f4139

added sweep:done label

picked the changes into the branch cherry-pick-890f41397af-master with commit 08f53f80

mentioned in commit 08f53f80

Sweep summary
successful:

• master

(see https://aiatlas154.cern.ch/jenkins/job/auto_git_sweeps/1765/console for details)

mentioned in merge request !47166 (merged)

mentioned in commit de249f68