Fix swaybar crash when there's no status_command

swaybar/bar.c

@@ -155,10 +155,12 @@ bool determine_bar_visibility(struct swaybar *bar, bool moving_layer) {
 	if (visible != bar->visible) {
 		bar->visible = visible;
 
-		wlr_log(WLR_DEBUG, "Sending %s signal to status command",
+		if (bar->status) {
-				visible ? "cont" : "stop");
+			wlr_log(WLR_DEBUG, "Sending %s signal to status command",
-		kill(bar->status->pid,
+					visible ? "cont" : "stop");
-				visible ? bar->status->cont_signal : bar->status->stop_signal);
+			kill(bar->status->pid, visible ?
+					bar->status->cont_signal : bar->status->stop_signal);
+		}
 	}
 
 	return visible;