prevent error when g:airline_section_x is undefined

[chrisbra]

I don't know why this happens, but I just got a bug report vim-airline/vim-airline#1627 where an error is caused by trying to access g:airline_section_x which seems to be undefined for that user.

So here is a fix, that does not unconditionally access that variable, but only when it exists.

fixes vim-airline/vim-airline#1627

Thanks!

[ryanoasis]

Thanks, gotcha yeah I did not understand how/why that would happen but this looks like a reasonable thing to do. Worst case it won't do anything, best case would help prevent the undefined. 😄

I'll get this merged with the next cut version

[chrisbra]

Great.

(Greetings to Charlotte. Have been living there 20 years ago, when I participated in an exchange student program. Hope you don't suffer from the extreme cold currently in the US)

[ryanoasis]

Hey. Oh that's cool! I've only been here for just over 4 years. Yeah it was very unseasonably cold a while ago but back to somewhat normal now. Thanks!