Don't populate job group agruments with jobs which don't have arguments.
Don't populate job group agruments with jobs which don't have arguments.

PiperOrigin-RevId: 377272949
Change-Id: Idc67e307b372f7f5befb3967441d8e25041ac1bd
GitOrigin-RevId: 82998d091f5a0aa44309a5938d58f31878d0a129

deepmind/xmanager,deepmind/xmanager