fixing TypeError: type of value sent to generator must be str

spiffworkflow-backend/src/spiffworkflow_backend/routes/tasks_controller.py

@@ -392,7 +392,7 @@ def process_data_show(
     )
 
 
-def _interstitial_stream(process_instance_id: int) -> Generator[str, str, None]:
+def _interstitial_stream(process_instance_id: int) -> Generator[str, Optional[str], None]:
     process_instance = _find_process_instance_by_id_or_raise(process_instance_id)
     processor = ProcessInstanceProcessor(process_instance)
     reported_ids = []  # bit of an issue with end tasks showing as getting completed twice.

spiffworkflow-backend/tests/spiffworkflow_backend/integration/test_process_api.py

@@ -1694,7 +1694,8 @@ class TestProcessApi(BaseTest):
 
         # Rather that call the API and deal with the Server Side Events, call the loop directly and covert it to
         # a list.  It tests all of our code.  No reason to test Flasks SSE support.
-        results = list(_interstitial_stream(process_instance_id))
+        stream_results = _interstitial_stream(process_instance_id)
+        results = list(stream_results)
         # strip the "data:" prefix and convert remaining string to dict.
         json_results = list(map(lambda x: json.loads(x[5:]), results))  # type: ignore
         # There should be 2 results back -