fix error, refs #20596

tests/test_mediaworker.py

@@ -51,7 +51,10 @@ def check_celerity_connectivity(ip):
     h = conf.get('MS_SERVER_NAME')
     cmd = "ssh %s curl -k https://%s:6200" % (ip, h)
     print('Checking celerity connectivity: %s' % cmd)
-    d = subprocess.check_output(cmd, shell=True, timeout=5)
+    try:
+        d = subprocess.check_output(cmd, shell=True, timeout=5)
+    except exception:
+        d = ''
     if "Celerity tasks server" in d:
         print('%sSuccessfully reached tasks server%s' % (GREEN, DEF))
         return True