METUtilities: Don't open files in ctors.

Don't try to open files in ctors in code that can run from the ctor of a Gaudi component --- otherwise, it'll run during genconf, etc. Do things like that in initialize instead.

This merge request affects 1 package:

• Reconstruction/MET/METUtilities

This merge request affects 1 file:

• Reconstruction/MET/METUtilities/Root/METSignificance.cxx

Adding @goetz as watcher

added JetEtmiss Reconstruction master review-pending-level-1 labels

CI Result SUCCESS (hash 5443abdc)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis
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
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 27104]

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

merged

mentioned in commit 642daa87

added sweep:ignore label