Add a gaurd after makeCluster like is used in egammaSuperClusterBuilderBase.

Add a guard used in egammaSuperClusterBuilderBase that was missed in the previous merge request !69469 (merged).

added 23 commits

• f36734a9...f25c369d - 22 commits from branch atlas:main
• 145ea665 - Merge branch 'main' into 'egammaForwardBuilderMakeClusterGaurd'

Compare with previous version

This merge request affects 1 package:

• Reconstruction/egamma/egammaAlgs

This merge request affects 1 file:

• Reconstruction/egamma/egammaAlgs/src/egammaForwardBuilder.cxx

Adding @goetz as watcher

added Egamma Reconstruction main review-pending-level-1 labels

CI Result SUCCESS (hash 145ea665)

	Athena
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 5855] (remote access info)

Straightforward change - approving

L1 shifter

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

merged

mentioned in commit 88ee1cf6

changed the description