Add approval message

config.go

@@ -41,6 +41,7 @@ func (c *Config) CreateConfig() error {
 		AdminChatId:     0,
 		TargetChatId:    0,
 		EntryMessage:    "You have requested to join the group, please write a brief message explaining why you want to join.",
+		ApprovalMessage: "",
 	}
 
 	encoder := yaml.NewEncoder(f)

main.go

@@ -147,9 +147,11 @@ func (bot *Bot) handleCallbackQuery(query *api.CallbackQuery) {
 			edit.ParseMode = api.ModeMarkdown
 			bot.API.Send(edit)
 
+			if bot.Config.ApprovalMessage != "" {
 				m := api.NewMessage(user.From.ID, bot.Config.ApprovalMessage)
 				m.ParseMode = api.ModeMarkdown
 				bot.API.Send(m)
+			}
 
 		case "reject":
 			r := api.DeclineChatJoinRequest{