Improve guard so it works for no eof new line

ftplugin/slim.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'slim') == -1
+
 if exists("b:did_ftplugin")
   finish
 endif
@@ -24,4 +25,5 @@ let b:undo_ftplugin = "setl isk<" . " | " . s:undo_ftplugin
 
 setlocal iskeyword+=-
 setlocal commentstring=/%s
+
 endif