Improve guard so it works for no eof new line

syntax/proto.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'protobuf') == -1
+
 " Protocol Buffers - Google's data interchange format
 " Copyright 2008 Google Inc.  All rights reserved.
 " https://developers.google.com/protocol-buffers/
@@ -106,4 +107,5 @@ if version >= 508 || !exists("did_proto_syn_inits")
 endif
 
 let b:current_syntax = "proto"
+
 endif