Make gsutil rsync -x with empty pattern raise CommandException
Make gsutil rsync -x with empty pattern raise CommandException

BrandonY/gsutil,mattdr/gsutil,dtjackson/gsutil,ttiurani/gsutil,fishjord/gsutil,GoogleCloudPlatform/gsutil,chriskuehl/gsutil-debian,dimfeld/gsutil,GoogleCloudPlatform/gsutil,craigcitro/gsutil