vim-patch:9.1.1206: tests: test_filetype fails when a file is a directory (#32905)

Problem:  tests: test_filetype fails when a file is a directory
          (Eisuke Kawashima)
Solution: When encountering a directory instead of a file, skip that
          particular filetype test

fixes: vim/vim#16894

63a885b650

Co-authored-by: Christian Brabandt <cb@256bit.org>

test/old/testdir/test_filetype.vim

@@ -934,6 +934,9 @@ func CheckItems(checks)
   set noswapfile
   for [ft, names] in items(a:checks)
     for i in range(0, len(names) - 1)
+      if isdirectory(fnameescape(names[i]))
+        continue
+      endif
       new
       try
         exe 'edit ' .. fnameescape(names[i])