Improve guard so it works for no eof new line

compiler/eslint.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'javascript') == -1
+
 " Vim compiler plugin
 " Language:     JavaScript
 " Maintainer:   vim-javascript community
@@ -15,4 +16,5 @@ endif
 
 CompilerSet makeprg=eslint\ -f\ compact\ %
 CompilerSet errorformat=%f:\ line\ %l\\,\ col\ %c\\,\ %m
+
 endif