Description of problem: /usr/share/GConf/gsettings/evolution.convert references a key that is no longer in the org.gnome.evolution.mail schema: 'mime-types'. Version-Release number of selected component (if applicable): evolution-3.12.8-1.fc21.x86_64
Thanks for a bug report. It's broken since 3.8.0 (some version earlier), but the gsettings converted didn't claim/crash on it before. Nonetheless, the key shouldn't be there, thus I made the change for evolution 3.13.10+ and 3.12.10+. https://git.gnome.org/browse/evolution/commit/?id=a3d8af4