fix

Author: matusdrobuliak66

services/web/server/src/simcore_service_webserver/projects/_crud_api_read.py

@@ -152,7 +152,9 @@ async def list_projects(  # pylint: disable=too-many-arguments
         ),
         # attrs
         filter_by_project_type=ProjectTypeAPI.to_project_type_db(project_type),
-        filter_by_template_type=ProjectTemplateTypeDB(template_type),
+        filter_by_template_type=(
+            ProjectTemplateTypeDB(template_type) if template_type else None
+        ),
         filter_by_services=user_available_services,
         filter_trashed=trashed,
         filter_hidden=show_hidden,