account for possible undefined variable.
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@ -65,7 +65,7 @@ function! airline#extensions#apply(...)
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if &buftype == 'quickfix'
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let w:airline_section_a = '%q'
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let w:airline_section_b = '%{w:quickfix_title}'
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let w:airline_section_b = '%{get(w:, "quickfix_title", "")}'
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let w:airline_section_c = ''
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let w:airline_section_x = ''
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elseif &buftype == 'help'
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