skip calendar events with empty title

shiftregister/importer/importer.py

@@ -25,11 +25,13 @@ def import_calendar(calendar):
         events = {}
         for event in cal.walk("vevent"):
             uid = event.decoded("uid").decode()
-            summary = event.decoded("summary").decode()
+            summary = (event.decoded("summary", None) or b"").decode()
             description = (event.decoded("description", None) or b"").decode()
             start = event.decoded("dtstart").astimezone(timezone.utc)
             end = event.decoded("dtend").astimezone(timezone.utc)
             location = event.decoded("location", None)
+            if not summary:
+                continue
             if location is not None:
                 location = location.decode()