fix possibility of the branch extension being unavailable. resolves #366.
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@ -17,7 +17,7 @@ function! s:get_hunks_signify()
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endfunction
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function! s:is_branch_empty()
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return get(g:, 'airline#extensions#branch#enabled', 1) && empty(airline#extensions#branch#head())
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return exists('*airline#extensions#branch#head') && empty(airline#extensions#branch#head())
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endfunction
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function! s:get_hunks_gitgutter()
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