Make list_patch_packages non fatal for RunTier0Tests.py

Since we updated atlasexternals to 2.0.28, we no longer write out ${WorkDir_DIR}/packages.txt that lists which packages are locally configured/compiled. As a result, RunTier0Tests.py was crashing. This merge request simply puts this step in a try block so that it's no longer a fatal problem. Instead, we print a warning message.

added alsoTargeting:21.0 alsoTargeting:21.3 labels

This merge request affects 1 package:

• Tools/PROCTools

Adding @amete as watcher

added Tools master review-pending-level-1 labels

This merge request affects 1 package:

• Tools/PROCTools

Adding @amete as watcher

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-23295-2019-05-10-02-57
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST 38248]

approved this merge request

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

merged

mentioned in commit 2b05bda2

added sweep:done label

mentioned in commit 5000ca82

mentioned in merge request !23347 (merged)

mentioned in commit 9591f034

mentioned in merge request !23348 (merged)

Sweep summary
successful:

• 21.0
• 21.3

(see https://aiatlas154.cern.ch/jenkins/job/auto_git_sweeps/773/console for details)

mentioned in commit 6593144e

mentioned in commit 3dfee216

mentioned in merge request !24191 (merged)

mentioned in commit 71376efd