
In case MultiStrOpt option's value is empty list, current extract_opts.py logic will ignore it. This patch aims to update func _print_opt: add the multistropt's option_name in conf even its value is empty list. This bug also affects https://bugs.launchpad.net/cinder/+bug/1240783 Closes-bug: #1241348 Change-Id: Ica1da0cd20c97a587964cb0059836d609a440145