Improve guard so it works for no eof new line

indent/lua.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'lua') == -1
+
 " Vim indent file
 " Language: Lua
 " URL: https://github.com/tbastos/vim-lua
@@ -115,4 +116,5 @@ function GetLuaIndent()
   return indent(prev_line) + (shiftwidth() * i)
 
 endfunction
+
 endif