DavDroid doesn't handle exceptions from weekly recurring appointment correct

[AutoImport-chanzler]

DavDroid doesn’t handle exceptions from weekly recurring appointment correct. The exceptions don’t appear on the mobile phone, but they appear in owncloud, which I use as caldav server. I can provide you with an example ics file, if needed.

[rfc2822]

Thanks for your efforts, but this is a duplicate of #170.