Bugfix: Query results args type none missing (#97)

* feat(importer): update query results args type to include None

Update QueryResultsArgsType definition to include None type for more
flexibility when handling query results. Add None to the typing
union to better support different data types. (issue: bugfix/query-results-args-type-none-missing)

* added test query

* added tests

* fragment

Author: rayakame

.changes/unreleased/Fixed-20250523-132705.yaml

@@ -0,0 +1,6 @@
+kind: Fixed
+body: Added `None` to `QueryResultsArgsType`
+time: 2025-05-23T13:27:05.7339672+02:00
+custom:
+    Author: rayakame
+    PR: "97"