ValueError while ICal export

[krissik]

In plone.app.event there is an bug mentioned that causes a value error while exporting an event with recurrence and RDATE

https://github.com/plone/plone.app.event/blame/master/plone/app/event/ical/exporter.py#L308

Can someone point me to more information about this bug? I can reproduce it with plone 6.0.9.

[davisagli]

@krissik I looked but did not find an existing issue about this bug. Can you share your steps to reproduce the problem?

[krissik]

If you add an additional date to recurrence of an event the ValueError is raised.

... and because ValueError is swallowed in plone.app.event the additional date is missing in export.

While debugging I saw that there are dashes in the date (val) which seems to be a problem.