exc_tracker: disable send-email if mail server is not configured.

rhodecode/lib/exc_tracking.py

@@ -95,9 +95,9 b' def _store_exception(exc_id, exc_type_na'
     if send_email is None:
         # NOTE(marcink): read app config unless we specify explicitly
         send_email = app.CONFIG.get('exception_tracker.send_email', False)
+
         mail_server = app.CONFIG.get('smtp_server') or None
         send_email = send_email and mail_server
-
     if send_email:
         try:
             send_exc_email(exc_id, exc_type_name)