Improve guard so it works for no eof new line

ftplugin/lilypond.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'lilypond') == -1
+
 " LilyPond filetype plugin
 " Language:     LilyPond (ft=ly)
 " Maintainer:   Heikki Junes <hjunes@cc.hut.fi>
@@ -56,4 +57,5 @@ setlocal dictionary-=$VIM/syntax/lilypond-words dictionary+=$VIM/syntax/lilypond
 setlocal complete-=k complete+=k
 "
 setlocal showmatch
+
 endif