use working dir weblog for failed requests

services/workflow/workflow/server.py

@@ -172,9 +172,14 @@ class WorkflowWorkingDirRestService:
         results_path = Path(requested_workflow.results_dir)
 
         index_path_list = list(results_path.glob("products/pipeline-*/html/index.html"))
+        failed_weblog_path_list = list(results_path.glob("working/pipeline-*/html/index.html"))
         if index_path_list and len(index_path_list) == 1:
             index_path = index_path_list[0]
+        elif failed_weblog_path_list and len(failed_weblog_path_list) == 1:
+            # check for weblog in working directory (needed for errored or failed requests)
+            index_path = failed_weblog_path_list[0]
         else:
+            # otherwise, return weblog not found
             return Response(
                 status_int=http.HTTPStatus.NOT_FOUND,
                 json_body={