fix: Patch request does not work with attributes unset

Author: micha91

polarion_rest_api_client/clients/work_items.py

@@ -742,7 +742,7 @@ def _build_work_item_type_change_patch_item(
         return api_models.WorkitemsListPatchRequestDataItem(
             type_=api_models.WorkitemsListPatchRequestDataItemType.WORKITEMS,
             id=f"{self._project_id}/{work_item.id}",
-            attributes=oa_types.UNSET,
+            attributes=api_models.WorkitemsListPatchRequestDataItemAttributes(),
         )
 
     def _has_content_to_patch(self, work_item: dm.WorkItem) -> bool:

tests/test_client_workitems.py

@@ -619,7 +619,7 @@ def test_update_work_item_pure_type_change_single_request(
     assert req.url.params["changeTypeTo"] == "newType"
     req_data = json.loads(req.content.decode("utf-8"))
     assert len(req_data["data"]) == 1
-    assert "attributes" not in req_data["data"][0]
+    assert req_data["data"][0].get("attributes") == {}
 
 
 def test_update_work_items_split_by_type(