rem: g_return_if_fail (totem->mrl != NULL);
add: if (totem->mrl == NULL) return;
context: action_play (Totem *totem, int offset){	int retval;	D("action_play");	g_return_if_fail (totem->mrl != NULL);	retval = gtk_xine_play (GTK_XINE (totem->gtx), totem->mrl, offset , 0);	play_pause_set_label (totem, retval);}