Fixed a bug in modeled app plotting

predtuner/modeledapp.py

@@ -449,6 +449,13 @@ class ApproxModeledTuner(ApproxTuner):
                 f"No tuning session has been run; call self.tune() first."
             )
 
+        # For empirical tuning there's no `validated_qos`.
+        # We first check, and if that's the case, we pass on to our parent class instead.
+        val_qos_nones = [conf.validated_qos is None for conf in self.kept_configs]
+        if any(val_qos_nones):
+            assert all(val_qos_nones)
+            return super().plot_configs(show_qos_loss, connect_best_points, False)
+
         def get_points(confs, validated):
             def qos_speedup(conf):
                 return conf.validated_qos if validated else conf.qos, conf.speedup