calendar crashes when bad dates returned from rrule.between in calendarfetcherutils.js #3256
Description
version, all
when rrule (provided by node-ical, now called ical) gets confused, it returns an array of invalid date objects from the between function.
dates: [ null,null,null,null....]
the code checking them then crashes because of the invalid date object.
there are an unknown number of causes
like this event from in the past
BEGIN:VEVENT
DTSTAMP:20210413T203456Z
UID:E689AEB8C02C4E2CADD8C7D3D303CEAD0
DTSTART;TZID="Amsterdam, Belgrade, Berlin, Brussels, Budapest, Madrid, Paris, Prague, Stockholm":20210415T190000
DTEND;TZID="Amsterdam, Belgrade, Berlin, Brussels, Budapest, Madrid, Paris, Prague, Stockholm":20210415T210000
CLASS:PUBLIC
LOCATION:albert heijn
SUMMARY:xxx xxxx
SEQUENCE:10
RRULE:FREQ=DAILY;UNTIL=20210418T170000Z
EXDATE;TZID="Amsterdam, Belgrade, Berlin, Brussels, Budapest, Madrid, Paris, Prague, Stockholm":20210417T190000
EXDATE;TZID="Amsterdam, Belgrade, Berlin, Brussels, Budapest, Madrid, Paris, Prague, Stockholm":20210416T190000
EXDATE;TZID="Amsterdam, Belgrade, Berlin, Brussels, Budapest, Madrid, Paris, Prague, Stockholm":20210415T190000
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER;RELATED=START:-PT15M
END:VALARM
END:VEVENT