[BUGFIX] do not crash on invalid input

bot/command.go

@@ -34,10 +34,18 @@ func (b *Bot) addSend(answer func(string), from string, params []string) {
 	if h == nil {
 		h = b.db.NewHost(host)
 	}
+	if h == nil {
+		answer(fmt.Sprintf("could not create host %s", host))
+		return
+	}
 	n, ok := b.db.NotifiesByAddress[to]
 	if !ok {
 		n = b.db.NewNotify(to)
 	}
+	if n == nil {
+		answer(fmt.Sprintf("could not create notify %s in list of %s", to, host))
+		return
+	}
 	h.AddNotify(n)
 
 	answer(fmt.Sprintf("added %s in list of %s", to, host))

database/notify.go

@@ -86,6 +86,9 @@ func (db *DB) AddNotify(n *Notify) {
 
 func (db *DB) NewNotify(to string) *Notify {
 	addr := strings.Split(to, ":")
+	if len(addr) != 2 {
+		return nil
+	}
 	n := &Notify{
 		Protocol: addr[0],
 		To:       addr[1],