Python query API needs to know when query is invalid

If you use the Python API to run the following query

region = {"wrongkey": ["aaaaaaa", True, "aaaaazzz", False]}
my_sleeper.range_key_query("system-test", [region])

where `wrongkey` is not a key field, then the query will hang forever polling the query results tracker. Review whether the query is tracked under this condition, and whether the Python API picks that up.