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account for possibilty of branch extension unavailable. resolves #419.
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@@ -47,7 +47,6 @@ function! airline#extensions#branch#get_head()
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let empty_message = get(g:, 'airline#extensions#branch#empty_message',
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\ get(g:, 'airline_branch_empty_message', ''))
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let symbol = get(g:, 'airline#extensions#branch#symbol', g:airline_symbols.branch)
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return empty(head)
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\ ? empty_message
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\ : printf('%s%s', empty(symbol) ? '' : symbol.(g:airline_symbols.space), head)
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