TrigDecisionTool: Fix cppcheck warning.

Potential null pointer dereference.

This merge request affects 1 package:

• Trigger/TrigAnalysis/TrigDecisionTool

This merge request affects 1 file:

• Trigger/TrigAnalysis/TrigDecisionTool/src/DecisionUnpackerAthena.cxx

Adding @tamartin as watcher

added Trigger master review-pending-level-1 labels

CI Result SUCCESS (hash 40fce22b)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
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
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 30088]

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

merged

mentioned in commit 4da14afb

added sweep:ignore label