Merge pull request #455 from taketwo/fix-empty-key-error

Fix "Cannot use empty key for Dictionary" error

autoload/airline/extensions/tabline/unique_tail_improved.vim

@@ -19,6 +19,7 @@ function! airline#extensions#tabline#unique_tail_improved#format(bufnr, buffers)
       let tokens = reverse(split(substitute(fnamemodify(name, ':p:.:h'), '\\', '/', 'g'), '/'))
       let token_index = 0
       for token in tokens
+        if token == '' | continue | endif
         if token == '.' | break | endif
         if !has_key(path_tokens, token_index)
           let path_tokens[token_index] = {}