Improve guard so it works for no eof new line

syntax/go.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'go') == -1
+
 " Copyright 2009 The Go Authors. All rights reserved.
 " Use of this source code is governed by a BSD-style
 " license that can be found in the LICENSE file.
@@ -411,4 +412,5 @@ syn sync minlines=500
 let b:current_syntax = "go"
 
 " vim: sw=2 ts=2 et
+
 endif