exc-tracking: fixed send-email bug when called from a source not attached to user session.

rhodecode/lib/exc_tracking.py

@@ -131,7 +131,7 b' def send_exc_email(request, exc_id, exc_'
 
     # NOTE(marcink): needed for email template rendering
     user_id = None
-    if request:
+    if hasattr(request, 'user'):
         user_id = request.user.user_id
     attach_context_attributes(TemplateArgs(), request, user_id=user_id, is_api=True)