From a76c9176c52a079f6baa556428c93ee0960bc4cb Mon Sep 17 00:00:00 2001
From: Jean-Romain Garnier <jean-romain.garnier@supelec.fr>
Date: Sun, 27 Dec 2020 15:47:41 +0100
Subject: [PATCH] Fix advanced search filters for empty query

---
 search/engine.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/search/engine.py b/search/engine.py
index dc4eede8..ae772514 100644
--- a/search/engine.py
+++ b/search/engine.py
@@ -564,4 +564,9 @@ def create_queries(query):
 
         queries.append(current_query)
 
+    # Make sure there is at least one query, even if it's empty
+    # Otherwise, display filters (for advanced search) won't work
+    # when the search text field is empty
+    queries = queries or [Query()]
+
     return queries