From a9804dd55062708c6857d4790ffb2d4028c26f3e Mon Sep 17 00:00:00 2001
From: Unrud <unrud@outlook.com>
Date: Sun, 4 Oct 2020 05:39:58 +0200
Subject: [PATCH] Don't use assertion for expected error

---
 radicale/server.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/radicale/server.py b/radicale/server.py
index 8cada22..d6e52fa 100644
--- a/radicale/server.py
+++ b/radicale/server.py
@@ -260,7 +260,8 @@ def serve(configuration, shutdown_socket=None):
                 logger.info("Listening on %r%s",
                             format_address(server.server_address),
                             " with SSL" if use_ssl else "")
-        assert servers, "no servers started"
+        if not servers:
+            raise RuntimeError("No servers started")
 
         # Mainloop
         select_timeout = None