fix error printing, refs #20586

tests/test_ssl.py

@@ -33,5 +33,5 @@ for s in conf_servers:
         requests.get(url)
         sys.exit(0)
     except requests.exceptions.SSLError as e:
-        print('Error: SSL certificate for %s is not valid' % (url, e))
+        print('Error: SSL certificate for %s is not valid: %s' % (url, e))
         sys.exit(1)