tlsappointmentbot: Also *log* exceptions if we ignore them

src/tlsappointmentbot.py

@@ -3,6 +3,7 @@
 import asyncio
 import datetime
 import logging
+import traceback
 from typing import List
 
 from selenium import webdriver
@@ -55,6 +56,7 @@ class TLSAppointmentBot:
                     await self.matrix_bot.send_appointments(appointments)
 
             except Exception:
+                logging.error(traceback.format_exc().strip())
                 await self.matrix_bot.send_warning()
 
             await asyncio.sleep(2 * 60)