dita_v2(test): assert semantic event emptiness

prod/clean_arch/dita_v2/test_bingx_post_ack_invariants.py

@@ -229,7 +229,7 @@ def test_kernel_never_rolls_back_indeterminate_post_ack_outcome(monkeypatch, sub
         slot = kernel._get_slot(0)
 
         assert outcome.accepted is True
-        assert outcome.emitted_events == []
+        assert not outcome.emitted_events
         assert slot.fsm_state is TradeStage.ENTRY_WORKING
         assert slot.trade_id == intent.trade_id
         assert slot.size == pytest.approx(0.0)