#52 fixed 'undefined index' notices

I have no idea why this bug still exists. This cookie has been implemented for a very long time and everybody should already have logged out and logged in again what sets this cookie. But as I still get dozens of reports because of that,I merge that now in the hope that it finally resolves the problem I'll never understand. Thanks for your help.

i was still signed in inside my nativefier "app". also i think you should never rely on cookies being there. there are many browser extensions that more or less intelligently clear cookies from sites.

Oh,that's bad :( Removing the cookie sets color and language to default. I can't store them in Javascript localStorage because these two are needed by the server. I hope extensions like that aren't used by too many people. At least the error message is gone now.