From dbfce230392927f83a921c29e8447287d4133187 Mon Sep 17 00:00:00 2001
From: Jover Lee <joverlee521@gmail.com>
Date: Tue, 30 Jul 2024 17:36:33 -0700
Subject: [PATCH] download: Dispatch error notification if dataset names are
 empty

An extra guard against empty dataset names during Auspice JSON downloads
Related to <https://github.com/nextstrain/auspice/issues/1803>
---
 src/components/download/helperFunctions.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/components/download/helperFunctions.js b/src/components/download/helperFunctions.js
index 969cd8dc9..3abb194b4 100644
--- a/src/components/download/helperFunctions.js
+++ b/src/components/download/helperFunctions.js
@@ -631,6 +631,10 @@ export const entropyTSV = (dispatch, filePrefix, entropy) => {
  */
 export const auspiceJSON = (dispatch, datasetNames) => {
   const filenames = [];
+  if (!datasetNames.some(Boolean)) {
+    console.error(`Unable to fetch empty dataset names: ${JSON.stringify(datasetNames)}`);
+    return dispatch(errorNotification({message: "Unable to download Auspice JSON (see console for more info)"}))
+  }
   for (const datasetName of datasetNames) {
     if (!datasetName) continue; // e.g. no 2nd tree
     const filename = datasetName.replace('/', '_') + '.json';