Protect against FPE in GSF MultiState merger

Small weight numbers lead to an FPE in MultiState merger causing issues down the chain. This is now protected.

Mentioning @christos Closes ATLASRECTS-5597

This merge request affects 1 package:

• Tracking/TrkFitter/TrkGaussianSumFilter

Adding @amorley as watcher

added Egamma Tracking master review-pending-level-1 labels

CI Result FAILURE (hash e9d4df79)

	Athena	AthSimulation	AnalysisBase	AthGeneration
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
AnalysisBase: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 17490]

So the dict issue and what seems to be the non-updated ref for muon. Both not related to GSF ...

added bugfix label

The changes look fine. Approving.

Jason (L1)

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

merged

mentioned in commit 66f7dba6

added sweep:ignore label