[Evolution] Recurring meetings must be saved

[Joakim Tjernlund <joakim tjernlund transmode se>]

When I get invites to recurring meetings in evo(3.16.5) I usally have to save them
to file before I can do anything with the meeting.
Attaching an example calendar.ics file which causes this behaviour.

View message souce says that the invite is encoded:
Content-Transfer-Encoding: base64
Content-Type: text/calendar

Attachment: calendar.ics
Description: calendar.ics