pull: Ensure worker queue finishes if we unhold an empty queue too
pull: Ensure worker queue finishes if we unhold an empty queue too

GNOME/ostree,resin-io/ostree,sujitfulse/ostree,resin-io/ostree,leandrosansilva/ostree,GNOME/ostree,sujitfulse/ostree,resin-io/ostree,leandrosansilva/ostree,gatispaeglis/ostree,leandrosansilva/ostree,GNOME/ostree,sujitfulse/ostree,GNOME/ostree,resin-io/ostree,leandrosansilva/ostree,gatispaeglis/ostree,gatispaeglis/ostree,gatispaeglis/ostree,sujitfulse/ostree,sujitfulse/ostree,resin-io/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree,leandrosansilva/ostree