check length of mail list before reading mail

queue_message/appointmentrequestsender.py

@@ -172,7 +172,8 @@ class AppointmentRequestSender(threading.Thread):
                                     self.logger.info("try to remove success contact from list to retrieve mails")
                                     self.list_to_retrieve_mails.remove(con)
                                 except Exception as e:
-                                    self.logger.info("exception while remove success contact from list to retrieve mails")
+                                    self.logger.info(
+                                        "exception while remove success contact from list to retrieve mails")
                                     print(e)
                         else:
                             can_continue = RequestResult.COOKIES_ERROR
@@ -208,7 +209,7 @@ class AppointmentRequestSender(threading.Thread):
         self.channel.start_consuming()
 
     def retreive_invalidate_urls(self):
-        if not self.already_read_emails:
+        if not self.already_read_emails and len(self.list_to_retrieve_mails) > 0:
             self.logger.info("will retreive_invalidate_urls")
             time.sleep(30)
             _mail_list = MONGO_STORE_MANAGER.get_destination_emails()