Check for empty input

ldvspec/lofardata/tasks.py

@@ -156,7 +156,13 @@ def insert_task_into_atdb(workspecification_id: int):
         pk=workspecification_id
     )
     inputs: Dict[str, Any] = work_spec.inputs.copy()
+
+    try:
         entries: List[dict] = inputs.pop("surls")
+    except IndexError:
+        logger.error("Work specification does not contain any surls. This should never happen")
+        raise RequestNotOk
+
 
     batches = split_entries_to_batches(entries, work_spec.batch_size)