add remove buses when empty

models/topic.go

@@ -1,6 +1,8 @@
 package models
 
-import "slices"
+import (
+	"slices"
+)
 
 // topic model
 type Topic struct {
@@ -33,6 +35,7 @@ func (t *Topic) RemoveSubscription(subs ...string) {
 		t.Subscribe = []string{}
 		return
 	}
+
 	for _, toDelete := range subs {
 		for i, a := range t.Subscribe {
 			if a == toDelete {