Improve guard so it works for no eof new line

autoload/rust/debugging.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'rust') == -1
+
 " For debugging, inspired by https://github.com/w0rp/rust/blob/master/autoload/rust/debugging.vim
 
 let s:global_variable_list = [
@@ -102,4 +103,5 @@ function! rust#debugging#InfoToFile(filename) abort
 endfunction
 
 " vim: set et sw=4 sts=4 ts=8:
+
 endif