don't ping with noone there

main.go

@@ -233,7 +233,9 @@ func main() {
 							for k := range v.Subs {
 								subs += k.String() + " "
 							}
-							client.SendText(room, fmt.Sprintf("Pinging %v", subs))
+							if len(v.Subs) > 0 {
+								client.SendText(room, fmt.Sprintf("Pinging %v", subs))
+							}
 							resp, err := client.SendStateEvent(room, event.NewEventType("im.vector.modular.widgets"), "dimension-m.video-simp-"+v.Name, NewYT(v.Name+"'s stream", v.CurrentStream, string(room)))
 							if err != nil {
 								log.Println("error embeding video")