Please describe the problem:
When starting Evolution with activated CalDav Plugin the whole Software seems to be waiting for the CalDav-Plugin to contact its server(s). If one of them is not reachable at the time, Evolution won't start up until the CalDav Plugins gets a timeout. At least this is what I've been watching.

Steps to reproduce:
1. Add a CalDav Source
2. Quit Evo
3. Make the Server disappear
4. Start Evolution


Actual results:
It takes a very looooooooong time until Evo popps up.

Expected results:
Evo to pop up quick and the CalDav Plugin to not block Evolution from starting.

Does this happen every time?
Yes.

Other information:
Debian SID, Evolution 2.22.1;