Merge branch '469446-fix-export' into 'master'

Add safeguard for author in export setter

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/157814



Merged-by: Brian Williams <bwilliams@gitlab.com>
Approved-by: Brian Williams <bwilliams@gitlab.com>
Co-authored-by: Subashis <schakraborty@gitlab.com>

ee/app/models/vulnerabilities/export.rb

@@ -104,7 +104,7 @@ def make_group_level_export(group)
 
     def make_instance_level_export
       self.project = self.group = nil
-      self.organization_id = set_organization(author.namespace)
+      self.organization_id = set_organization(author&.namespace)
     end
 
     def set_organization(namespace)