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Query with non-existent nested fields causes 500 error

Query with non-existent nested fields causes 500 error: a task in LegoFlow-SWE (Harbor dataset). When filtering entities (groups, topics, subscriptions) through the query endpoint, passing a query object that references a nested field that does not exist on the entity (e.g., {"query"…

The task

When filtering entities (groups, topics, subscriptions) through the query endpoint, passing a query object that references a **nested field that does not exist on the entity** (e.g., `{"query": {"endpoint.nested": "xxx"}}`) results in an unhandled exception and an HTTP 500 Internal Server Error response.

Part of Lego-X/LegoFlow-SWE.