misc: clean assignment when turning export to model non interactive (#72686)

tests/admin_pages/test_workflow.py

@@ -1914,6 +1914,12 @@ def test_workflows_export_to_model_action_display(pub):
     resp = app.get('/backoffice/workflows/1/status/1/')
     assert 'Document Creation (with model named test.rtf of 45.6 KB)' in resp
 
+    resp = app.get(export_to.get_admin_url())
+    resp.form['method'] = 'Non interactive'
+    resp = resp.form.submit('submit')
+    workflow.refresh_from_storage()
+    assert not workflow.possible_status[0].items[0].by
+
 
 def test_workflows_variables_with_export_to_model_action(pub):
     test_workflows_variables(pub)

wcs/wf/export_to_model.py

@@ -515,6 +515,11 @@ class ExportToModel(WorkflowStatusItem):
                 value=self.filename,
             )
 
+    def submit_admin_form(self, form):
+        super().submit_admin_form(form)
+        if not form.has_errors() and not self.is_interactive():
+            self.by = []
+
     def get_model_file_parameter_view_value(self):
         return htmltext('<a href="status/%s/items/%s/?file=model_file">%s</a>') % (
             self.parent.id,