From 31604a49f8c4c42652716d68b684b41f32c3d3b3 Mon Sep 17 00:00:00 2001
From: Rafael Elter <rafael.elter@ufrgs.br>
Date: Thu, 25 Nov 2021 14:44:24 -0300
Subject: [PATCH] collect_many_bds empty data

---
 src/blp/blp.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/blp/blp.py b/src/blp/blp.py
index 7ace55a..0ac26f9 100644
--- a/src/blp/blp.py
+++ b/src/blp/blp.py
@@ -886,9 +886,10 @@ def collect_many_to_bds(self, responses) -> Dict:
             sec_dict = res.get(security, {})
             for field in response["data"]:
                 data = response["data"][field]
-                rows = sec_dict.get(field, [])
-                rows.extend(data)
-                sec_dict[field] = rows
+                if data:
+                    rows = sec_dict.get(field, [])
+                    rows.extend(data)
+                    sec_dict[field] = rows
             res[security] = sec_dict
         for s in res:
             for f in res[s]: