From fd1bee9bf6f739f454b8fcf07b010b655e434b73 Mon Sep 17 00:00:00 2001
From: John Ricklefs <jricklefs@quantopian.com>
Date: Thu, 17 Sep 2015 19:31:47 -0400
Subject: [PATCH] ENH: Don't trigger AssetDateBounds for orders of 0 shares.

---
 zipline/finance/controls.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/zipline/finance/controls.py b/zipline/finance/controls.py
index 8986c7be..f34444e0 100644
--- a/zipline/finance/controls.py
+++ b/zipline/finance/controls.py
@@ -297,6 +297,10 @@ class AssetDateBounds(TradingControl):
         Fail if the algo has passed this Asset's end_date, or before the
         Asset's start date.
         """
+        # If the order is for 0 shares, then silently pass through.
+        if amount == 0:
+            return
+
         normalized_algo_dt = pd.Timestamp(algo_datetime).normalize()
 
         # Fail if the algo is before this Asset's start_date