From c236bc83270f4d7dacb2a72a714777ee94ff0aaa Mon Sep 17 00:00:00 2001
From: Damien Elmes <git@ichi2.net>
Date: Wed, 23 May 2012 13:08:51 +0900
Subject: [PATCH] don't show hourly perf. graph if few datapoints

---
 anki/stats.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/anki/stats.py b/anki/stats.py
index 32b4f2577..3dc0f1fe8 100644
--- a/anki/stats.py
+++ b/anki/stats.py
@@ -504,6 +504,8 @@ order by thetype, ease""" % lim)
                 mcount = d[2]
         shifted.sort()
         counts.sort()
+        if len(counts) < 4:
+            return ""
         for d in shifted:
             hour = d[0]
             pct = d[1]