From 90b55ef277525922dd4a9495efb984a18d02a8d9 Mon Sep 17 00:00:00 2001
From: Sven Augustin <sven.augustin@psi.ch>
Date: Tue, 11 Feb 2025 13:06:44 +0100
Subject: [PATCH] use None (bsread.source default) if channels are empty

---
 bstrd/bscache.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bstrd/bscache.py b/bstrd/bscache.py
index 3a77978..39d7f9f 100644
--- a/bstrd/bscache.py
+++ b/bstrd/bscache.py
@@ -35,7 +35,7 @@ class BSCache:
 
     def run(self, running):
         timeout_counter = 0
-        configs = self.channels.values()
+        configs = self.channels.values() or None
         with source(channels=configs, **self.kwargs) as src:
             while running.is_set():
                 msg = src.receive()