From df5671927fb3ab924179a69b1afa4fef9563b27c Mon Sep 17 00:00:00 2001
From: Tyler Hallada <thallada@edx.org>
Date: Fri, 26 Jan 2018 15:49:50 -0500
Subject: [PATCH] Handle no assets results case properly

---
 common/lib/xmodule/xmodule/contentstore/mongo.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/common/lib/xmodule/xmodule/contentstore/mongo.py b/common/lib/xmodule/xmodule/contentstore/mongo.py
index 0f2274ed03..019f506f79 100644
--- a/common/lib/xmodule/xmodule/contentstore/mongo.py
+++ b/common/lib/xmodule/xmodule/contentstore/mongo.py
@@ -297,9 +297,14 @@ class MongoContentStore(ContentStore):
             })
 
         items = self.fs_files.aggregate(pipeline_stages)
-        result = items['result'][0]
-        count = result['count']
-        assets = list(result['results'])
+        if items['result']:
+            result = items['result'][0]
+            count = result['count']
+            assets = list(result['results'])
+        else:
+            # no results
+            count = 0
+            assets = []
 
         # We're constructing the asset key immediately after retrieval from the database so that
         # callers are insulated from knowing how our identifiers are stored.