TrigServices: only create worker directory if needed

When running athenaHLT, only create the per-worker directories if there are any histogram output files defined in the THistSvc.

This merge request affects 1 package:

• HLT/Trigger/TrigControl/TrigServices

Adding @wiedenma ,@rbielski ,@fwinkl as watchers

added Trigger master review-pending-level-1 labels

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-20513-2019-01-22-15-33
Athena: number of compilation errors 0, warnings 3
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST 32530] (for remote access see the FAQ for MR reviewers)

Changes look fine, approving.

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

merged

mentioned in commit 2d75dc50

added sweep:ignore label