Add protection for photons with no layer 1 EM clusters for pointing tool

The photon pointing tool might run over photons which don't have any EM1 cluster. This would trigger a warning from the ShowerDepthTool. https://gitlab.cern.ch/atlas/athena/-/blob/main/Reconstruction/egamma/egammaUtils/Root/ShowerDepthTool.cxx#L111

To avoid this an early check is added here, returning the same value as the ShowerDepthTool would but avoiding the warning.

FYI @christos @atishelm @gdigrego

added Egamma label

changed title from Add protection for photons with no layer 1 EM clusters to Add protection for photons with no layer 1 EM clusters for pointing tool

This merge request affects 1 package:

• Reconstruction/egamma/egammaUtils

This merge request affects 1 file:

• Reconstruction/egamma/egammaUtils/Root/egPhotonWrtPoint.cxx

Adding @goetz as watcher

added Reconstruction analysis-review-required main review-pending-level-1 labels

CI Result SUCCESS (hash 184d98c3)

	Athena	AnalysisBase	AthAnalysis
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 2946]

removed review-pending-level-1 label

added review-approved label

added analysis-review-approved label and removed analysis-review-required label

merged

mentioned in commit 32196d76