From eddc39589515e4c988216858b1a733bd6f908d8e Mon Sep 17 00:00:00 2001
From: James Hadfield <hadfield.james@gmail.com>
Date: Wed, 23 Feb 2022 13:38:02 +1300
Subject: [PATCH] [bugfix] Allow datasets without mutations

See https://github.com/nextstrain/auspice/issues/1474 for more context
---
 src/util/treeMiscHelpers.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/util/treeMiscHelpers.js b/src/util/treeMiscHelpers.js
index dff02c07e..e46643fb0 100644
--- a/src/util/treeMiscHelpers.js
+++ b/src/util/treeMiscHelpers.js
@@ -173,6 +173,9 @@ export const getSeqChanges = (fromNode) => {
  */
 export const categoriseMutations = (mutations, observedMutations, seqChangesToRoot) => {
   const categorisedMutations = {};
+  if (typeof mutations !== "object") {
+    return categorisedMutations;
+  }
   for (const gene of Object.keys(mutations)) {
     const categories = { unique: [], homoplasies: [], gaps: [], reversionsToRoot: []};
     const isNuc = gene==="nuc";