Improve guard so it works for no eof new line

syntax/ps1xml.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'powershell') == -1
+
 " Vim syntax file
 " Language:           Windows PowerShell XML
 " Maintainer:         Peter Provost <peter@provost.org>
@@ -55,4 +56,5 @@ let b:current_syntax = "ps1xml"
 let &cpo = s:ps1xml_cpo_save
 unlet s:ps1xml_cpo_save
 
+
 endif