From 568174222382479fe7d63eee86632086d16daefa Mon Sep 17 00:00:00 2001
From: Pedro Euko <pedro.euko@gmail.com>
Date: Fri, 15 Jan 2016 14:04:16 -0200
Subject: [PATCH] Check if permalink key was given

---
 lib/jekyll/convertible.rb | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/jekyll/convertible.rb b/lib/jekyll/convertible.rb
index 5406f13d..23d338a3 100644
--- a/lib/jekyll/convertible.rb
+++ b/lib/jekyll/convertible.rb
@@ -61,7 +61,7 @@ module Jekyll
         Jekyll.logger.abort_with "Fatal:", "Invalid YAML front matter in #{File.join(base, name)}"
       end
 
-      unless valid_permalink?(self.data['permalink'])
+      if self.data['permalink'] && empty_permalink?(self.data['permalink'])
         Jekyll.logger.error "Error:", "Invalid permalink in #{File.join(base, name)}"
       end
 
@@ -275,8 +275,8 @@ module Jekyll
     # permalink - the data permalink
     #
     # Returns true if the permalink is valid, false if otherwise
-    def valid_permalink?(permalink)
-      permalink.nil? || permalink.length > 0
+    def empty_permalink?(permalink)
+      permalink.length == 0
     end
 
     # Write the generated page file to the destination directory.