Improve guard so it works for no eof new line

syntax/fsharp.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'fsharp') == -1
+
 " Vim syntax file
 " Language:     F#
 " Last Change:  Sun 19 Oct 2014 11:11:44 PM CEST
@@ -264,4 +265,5 @@ endif
 let b:current_syntax = 'fsharp'
 
 " vim: sw=4 et sts=4
+
 endif