From 20cddb6a2505ec943592abd515f7373e53331396 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Robert=20J=C3=B6rdens?= <rj@quartiq.de>
Date: Mon, 24 Sep 2018 09:19:28 +0000
Subject: [PATCH] tester: handle no available ttl outputs

---
 artiq/examples/kasli_basic/repository/kasli_tester.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/artiq/examples/kasli_basic/repository/kasli_tester.py b/artiq/examples/kasli_basic/repository/kasli_tester.py
index 2c00b1620..475925db2 100644
--- a/artiq/examples/kasli_basic/repository/kasli_tester.py
+++ b/artiq/examples/kasli_basic/repository/kasli_tester.py
@@ -156,7 +156,9 @@ class KasliTester(EnvExperiment):
 
     def test_ttl_ins(self):
         print("*** Testing TTL inputs.")
-
+        if not self.ttl_outs:
+            print("No TTL output channel available to use as stimulus.")
+            return
         ttl_out_name, ttl_out_dev = next(iter(self.ttl_outs))
         for ttl_in_name, ttl_in_dev in self.ttl_ins:
             print("Connect {} to {}. Press ENTER when done."