various fixes from first test runs

Change-Id: Ifa5a780dc0123aa84273c57c726c8c1bea563495
diff --git a/src/osmo-gsm-tester.py b/src/osmo-gsm-tester.py
index 80fec4f..b6e22f1 100755
--- a/src/osmo-gsm-tester.py
+++ b/src/osmo-gsm-tester.py
@@ -115,6 +115,9 @@
 
         if combination_strs:
             print('Running default suites:\n  ' + ('\n  '.join(combination_strs)))
+        else:
+            print('No default suites configured (%r)' % config.DEFAULT_SUITES_CONF)
+
 
     if not combination_strs:
         raise RuntimeError('Need at least one suite:scenario or series to run')