Improve guard so it works for no eof new line

indent/cabal.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'haskell') == -1
+
 " indentation for cabal
 "
 " author: raichoo (raichoo@googlemail.com)
@@ -30,4 +31,5 @@ function! GetCabalIndent()
     return match(l:prevline, '\S')
   endif
 endfunction
+
 endif