fix #1747

ralsina · ralsina · commit 9a8101de9611 · 2015-05-23T12:07:15.000-03:00
diff --git a/CHANGES.txt b/CHANGES.txt
@@ -14,6 +14,7 @@ Features
 Bugfixes
 --------
 
+* Avoid some rebuild loops (Issue #1747)
 * Better error if two posts/pages output conflict (Issue #1749)
 * Scanning of posts refactored out of core (Issue #1700)
 * github_deploy records lastdeploy timestamp like regular deploy
diff --git a/nikola/post.py b/nikola/post.py
@@ -235,7 +235,11 @@ def __repr__(self):
         m = hashlib.md5()
         # source_path modification date (to avoid reading it)
         m.update(utils.unicode_str(os.stat(self.source_path).st_mtime).encode('utf-8'))
-        m.update(utils.unicode_str(json.dumps(self.meta, cls=utils.CustomEncoder, sort_keys=True)).encode('utf-8'))
+        clean_meta = {}
+        for k, v in self.meta.items():
+            if v:
+                clean_meta[k] = v
+        m.update(utils.unicode_str(json.dumps(clean_meta, cls=utils.CustomEncoder, sort_keys=True)).encode('utf-8'))
         return '<Post: {0} {1}>'.format(self.source_path, m.hexdigest())
 
     def _has_pretty_url(self, lang):
