be explicit when we return None

1 files changed, 1 insertions, 0 deletions

diff --git a/siglog-witness.py b/siglog-witness.py
index 0ddb8b7..5b799e0 100755
--- a/siglog-witness.py
+++ b/siglog-witness.py
@@ -223,6 +223,7 @@ class TreeHead:
                                                          proof.path())
             return ERR_CONSISTENCYPROOF_INVALID, errmsg
 
+        return None             # Success
 
 class ConsistencyProof():
     def __init__(self, consistency_proof_data):