I'd like to request adding an option the the Perforce: Unshelve build step to fail the build if the unshelve changelist does not exist.

Perhaps a checkbox with "Fail build if unshelve changelist does not exist"

Currently the console output looks like this when unshelving using a shelve list that does not exists.

  p4 unshelve -f -s252595 -cdefault

  No such file(s).

For our workflow it would be an error for the build to pass if there were no shelved files.