bling/vim-airline — pull request #116 by LeszekSwirski (2013-08-05 17:49:36+00:00)
Title: Make themes#generate_color_map robust against undefined highlights

I had a problem where even "Normal" didn't have a "ctermbg" defined with jellybeans/t_Co=16. This adds a fallback to s:get_syn which returns white-on-black if it can't find anything better.