fix: rm queue

Author: phi-friday

tests/test_bayesian_optimization.py

@@ -248,23 +248,23 @@ def reset(self):
     optimizer.subscribe(event=Events.OPTIMIZATION_END, subscriber=tracker, callback=tracker.update_end)
 
     optimizer.maximize(init_points=0, n_iter=0)
-    assert optimizer._queue.empty
+    assert not optimizer._queue
     assert len(optimizer.space) == 1
     assert tracker.start_count == 1
     assert tracker.step_count == 1
     assert tracker.end_count == 1
 
     optimizer.set_gp_params(alpha=1e-2)
     optimizer.maximize(init_points=2, n_iter=0)
-    assert optimizer._queue.empty
+    assert not optimizer._queue
     assert len(optimizer.space) == 3
     assert optimizer._gp.alpha == 1e-2
     assert tracker.start_count == 2
     assert tracker.step_count == 3
     assert tracker.end_count == 2
 
     optimizer.maximize(init_points=0, n_iter=2)
-    assert optimizer._queue.empty
+    assert not optimizer._queue
     assert len(optimizer.space) == 5
     assert tracker.start_count == 3
     assert tracker.step_count == 5