From f65299c68c2eccf885aa440d5efe88d0ffbd4b14 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrg=20Billeter?= <j@bitron.ch>
Date: Thu, 20 Feb 2020 10:53:36 +0100
Subject: cascache.py: Don't trip up on empty digests in fetch_blobs()

---
 src/buildstream/_cas/cascache.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/buildstream/_cas/cascache.py b/src/buildstream/_cas/cascache.py
index c733bacac..cfdd4af09 100644
--- a/src/buildstream/_cas/cascache.py
+++ b/src/buildstream/_cas/cascache.py
@@ -649,7 +649,8 @@ class CASCache:
         batch = _CASBatchRead(remote)
 
         for digest in digests:
-            batch.add(digest)
+            if digest.hash:
+                batch.add(digest)
 
         batch.send(missing_blobs=missing_blobs)
 
-- 
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