added missing line to default binom_conf_interval for n=0 case

diff --git a/p2pool/util/math.py b/p2pool/util/math.py
index 392b0b7..de47dcc 100644 (file)
--- a/p2pool/util/math.py
+++ b/p2pool/util/math.py
@@ -123,6 +123,7 @@ except ImportError:
         assert 0 <= x <= n and 0 <= conf < 1
         if n == 0:
             left = random.random()*(1 - conf)
+            return left, left + conf
         # approximate - Wilson score interval
         z = math.sqrt(2)*ierf(conf)
         p = x/n