From c63b51b6612a0bb867a69dff2aa38d66a08eb2a4 Mon Sep 17 00:00:00 2001
From: Parker Moore <parkrmoore@gmail.com>
Date: Fri, 25 Dec 2015 22:54:12 -0500
Subject: [PATCH] document: revert comparison of Documents to old style & add
 nil check

@envygeeks, this should address your comment: https://github.com/jekyll/jekyll/commit/fcce0d5482e6cd541e3e6857cad00a6969a9dd4e#commitcomment-15162261
---
 lib/jekyll/document.rb | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/lib/jekyll/document.rb b/lib/jekyll/document.rb
index a1bf6bad..8c1b77cf 100644
--- a/lib/jekyll/document.rb
+++ b/lib/jekyll/document.rb
@@ -356,11 +356,9 @@ module Jekyll
     #   equal or greater than the other doc's path. See String#<=> for more details.
     def <=>(other)
       return ArgumentError.new("document cannot be compared against #{other}") unless other.respond_to?(:data)
-      if data['date'] && other.data['date'] && (cmp = data['date'] <=> other.data['date']) != 0
-        cmp
-      else
-        path <=> other.path
-      end
+      cmp = data['date'] <=> other.data['date']
+      cmp = path <=> other.path if cmp.nil? || cmp == 0
+      cmp
     end
 
     # Determine whether this document should be written.