diff --git a/anki/sync.py b/anki/sync.py
index a866dd99e..951ec767b 100644
--- a/anki/sync.py
+++ b/anki/sync.py
@@ -591,6 +591,7 @@ values
             stat.toDB(self.deck.s)
 
     def bundleHistory(self):
+        return []
         return self.realTuples(self.deck.s.all("""
 select cardId, time, lastInterval, nextInterval, ease, delay,
 lastFactor, nextFactor, reps, thinkingTime, yesCount, noCount
diff --git a/anki/utils.py b/anki/utils.py
index f116e87d9..24f9a63bd 100644
--- a/anki/utils.py
+++ b/anki/utils.py
@@ -108,6 +108,10 @@ def parseTags(tags):
 def joinTags(tags):
     return u", ".join(tags)
 
+def canonifyTags(tags):
+    "Strip leading/trailing/superfluous commas."
+    return joinTags(parseTags(tags))
+
 def findTag(tag, tags):
     "True if TAG is in TAGS. Ignore case."
     return tag.lower() in [t.lower() for t in tags]