workflows: record error when user to assign cannot be found (#52068)

tests/test_workflows.py

@@ -5911,10 +5911,16 @@ def test_create_carddata_user_association(two_pubs):
     formdata.data = {}
     formdata.user_id = user.id
     formdata.just_created()
+    if two_pubs.loggederror_class:
+        two_pubs.loggederror_class.wipe()
     formdata.perform_workflow()
 
     assert carddef.data_class().count() == 1
     assert carddef.data_class().select()[0].user is None
+    if two_pubs.loggederror_class:
+        assert two_pubs.loggederror_class.count() == 1
+        logged_error = two_pubs.loggederror_class.select()[0]
+        assert logged_error.summary == 'Failed to attach user (not found: "zzz")'
 
     # user association on invalid template
     carddef.data_class().wipe()

wcs/wf/create_formdata.py

@@ -451,6 +451,12 @@ class CreateFormdataWorkflowStatusItem(WorkflowStatusItem):
                 new_formdata.user = value
             else:
                 new_formdata.user = get_publisher().user_class.lookup_by_string(value)
+                if value and not new_formdata.user:
+                    get_publisher().record_error(
+                        _('Failed to attach user (not found: "%s")') % value,
+                        formdata=formdata,
+                        status_item=self,
+                    )
 
         if self.keep_submission_context:
             new_formdata.submission_context = formdata.submission_context or {}