add guard for possible undefined window context (#276).
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@ -120,7 +120,12 @@ function! s:invoke_funcrefs(context, funcrefs)
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endfunction
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function! airline#statusline(winnr)
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if has_key(s:contexts, a:winnr)
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return '%{airline#check_mode('.a:winnr.')}'.s:contexts[a:winnr].line
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endif
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" in rare circumstances this happens...see #276
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return ''
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endfunction
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function! airline#check_mode(winnr)
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