Fix potential null pointer exception in request detail page

* apparently, the `record` can be unset sometimes

invenio_theme_tuw/theme/templates/semantic-ui/invenio_requests/rdm-curation/index.html

@@ -13,7 +13,7 @@
 
 {%- extends "invenio_requests/details/index.html" %}
 {%- set is_curator = current_user.has_role(config["CURATIONS_MODERATION_ROLE"]) %}
-{%- set is_uploader = current_user.id|string == record.parent.access.owned_by.user|string %}
+{%- set is_uploader = record and current_user.id|string == record.parent.access.owned_by.user|string %}
 {%- set active_dashboard_menu_item = "curation-overview" if is_curator else "requests" %}
 
 {%- block request_header %}