From 4d88cfc78d5ed8996725440698e7d893e4ef7559 Mon Sep 17 00:00:00 2001
From: Hocuri <hocuri@gmx.de>
Date: Thu, 13 Oct 2022 15:05:46 +0200
Subject: [PATCH] Don't use empty authserv id candidates if intersection is
 empty

---
 src/authres_handling.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/authres_handling.rs b/src/authres_handling.rs
index 769a1af3e..99c050398 100644
--- a/src/authres_handling.rs
+++ b/src/authres_handling.rs
@@ -142,8 +142,9 @@ async fn update_authservid_candidates(
 
     let old_config = context.get_config(Config::AuthservidCandidates).await?;
     let old_ids = parse_authservid_candidates_config(&old_config);
-    if !old_ids.is_empty() {
-        new_ids = old_ids.intersection(&new_ids).copied().collect();
+    let intersection: HashSet<&str> = old_ids.intersection(&new_ids).copied().collect();
+    if !intersection.is_empty() {
+        new_ids = intersection;
     }
     // If there were no AuthservIdCandidates previously, just start with
     // the ones from the incoming email