Improve guard so it works for no eof new line

indent/d.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'dlang') == -1
+
 " Vim indent file for the D programming language (version 1.076 and 2.063).
 "
 " Language:     D
@@ -76,4 +77,5 @@ function GetDIndent()
 
   return cind
 endfunction
+
 endif