Fix importand and todo highlighting in kmail2's message list
Review Request #110098 - Created April 20, 2013 and submitted
Kmail2 stops hightlighting important and todo messages if you mouse over them. This is a simple patch to ignore nepomuk tag's color if it is invalid (QColor(0,0,0)). More details about this problem in http://bugs.kde.org/313223.
Works with my local installation without any side effects so far. I have not tested tagging my e-mails in nepomuk though.