Improve guard so it works for no eof new line

autoload/crystal_lang.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+
 let s:save_cpo = &cpo
 set cpo&vim
 
@@ -339,4 +340,5 @@ endfunction
 
 let &cpo = s:save_cpo
 unlet s:save_cpo
+
 endif