[History] Fix error when there are no entries

Fix #1512

autoload/fzf/vim.vim

@@ -612,6 +612,9 @@ endfunction
 
 function! s:history_source(type)
   let max = histnr(a:type)
+  if max <= 0
+    return ['No entries']
+  endif
   let fmt = s:yellow(' %'.len(string(max)).'d ', 'Number')
   let list = filter(map(range(1, max), 'histget(a:type, - v:val)'), '!empty(v:val)')
   return extend([' :: Press '.s:magenta('CTRL-E', 'Special').' to edit'],