From 5025e81e9d67a7903b5e535b8f76b9a178e541da Mon Sep 17 00:00:00 2001
From: pswain <peter.swain@ed.ac.uk>
Date: Fri, 29 Sep 2023 18:56:14 +0100
Subject: [PATCH] fixed merge_lineage for when no valid lineages

---
 src/agora/utils/merge.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/agora/utils/merge.py b/src/agora/utils/merge.py
index 8db36bb3..183acbde 100644
--- a/src/agora/utils/merge.py
+++ b/src/agora/utils/merge.py
@@ -96,6 +96,8 @@ def merge_lineage(
             replacement_dict[tuple(index)]
             for index in flat_lineage[valid_lineages]
         ]
+    else:
+        new_merges = merges
     # reverse flattening
     new_lineage = flat_lineage.reshape(-1, 2, 2)
     # remove any duplicates
-- 
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