exc-tracker: make context attribute behave like in API case

- simplified how use of api attachment of the attributes is done so we can explicitly pass it.
- for celery we need this else it fails to send emails

rhodecode/lib/base.py

@@ -283,7 +283,7 b' def get_current_lang(request):'
     return getattr(request, '_LOCALE_', request.locale_name)
 
 
-def attach_context_attributes(context, request, user_id=None):
+def attach_context_attributes(context, request, user_id=None, is_api=None):
     """
     Attach variables into template context called `c`.
     """
@@ -379,6 +379,7 b' def attach_context_attributes(context, r'
         "sideside": "sideside"
     }.get(request.GET.get('diffmode'))
 
+    if is_api is not None:
     is_api = hasattr(request, 'rpc_user')
     session_attrs = {
         # defaults

rhodecode/lib/exc_tracking.py

@@ -119,7 +119,10 b' def send_exc_email(exc_id, exc_type_name'
     log.debug('Sending Email exception to: `%s`', recipients or 'all super admins')
 
     # NOTE(marcink): needed for email template rendering
-    attach_context_attributes(TemplateArgs(), request, request.user.user_id)
+    user_id = None
+    if request:
+        user_id = request.user.user_id
+    attach_context_attributes(TemplateArgs(), request, user_id=user_id, is_api=True)
 
     email_kwargs = {
         'email_prefix': app.CONFIG.get('exception_tracker.email_prefix', '') or '[RHODECODE ERROR]',