Improve guard so it works for no eof new line

autoload/rust.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'rust') == -1
+
 " Author: Kevin Ballard
 " Description: Helper functions for Rust commands/mappings
 " Last Modified: May 27, 2014
@@ -545,4 +546,5 @@ endfunction
 " }}}1
 
 " vim: set et sw=4 sts=4 ts=8:
+
 endif