Improve guard so it works for no eof new line

syntax/plantuml.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'plantuml') == -1
+
 scriptencoding utf-8
 " Vim syntax file
 " Language:     PlantUML
@@ -395,4 +396,5 @@ highlight default link plantumlStereotype Type
 
 let &cpoptions=s:cpo_orig
 unlet s:cpo_orig
+
 endif