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Created attachment 1688846 [details]
backtrace of the crash

Description of problem:
Creating an empty attendee on a new Meeting will crash evolution any time I left/right click on the event. 

Version-Release number of selected component (if applicable):
evolution-data-server-debuginfo-3.28.5-5.el7.x86_64
evolution-ews-3.28.5-6.el7.x86_64
evolution-langpacks-3.28.5-8.el7.noarch
evolution-data-server-3.28.5-5.el7.x86_64
evolution-3.28.5-8.el7.x86_64
evolution-debuginfo-3.28.5-8.el7.x86_64
evolution-ews-langpacks-3.28.5-6.el7.noarch
evolution-data-server-langpacks-3.28.5-5.el7.noarch


How reproducible:


Steps to Reproduce:
1. Create Meeting
2. Have an empty user as attendee.
3. Save the Meeting
4. Click on the Meeting.

Actual results:
Crash of evolution

Expected results:
Evolution will not crash

Additional info:

A meeting with attendees like this:

ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;
 RSVP=TRUE;LANGUAGE=en:user
ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;
 RSVP=TRUE;LANGUAGE=en:

can cause the crash. This is partly related to bug #1721543.

Unable to reproduce with evolution-3.28.5-9

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (evolution-data-server bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:3995