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MyDummyClassifer/MyDummyRegressor fails when printed

See original GitHub issue

Describe the bug

When all the pipelines failed due to any reason, MyDummyClassifier is selected as best model. When using show_models api, execution fails.

To Reproduce

import sklearn.datasets
import sklearn.metrics
import autosklearn.classification
X, y = sklearn.datasets.load_breast_cancer(return_X_y=True)
automl = autosklearn.classification.AutoSklearnClassifier(
    time_left_for_this_task=30,
    per_run_time_limit=1,
    tmp_folder='/tmp/autosklearn_classification_example_tmp',
    output_folder='/tmp/autosklearn_classification_example_out',
)
automl.fit(X, y, dataset_name='breast_cancer')
print(automl.show_models())

Actual behavior, stacktrace or logfile

Traceback (most recent call last):
  File "example_classification.py", line 40, in <module>
    print(automl.show_models())
  File "automl/lib/python3.7/site-packages/autosklearn/estimators.py", line 482, in show_models
    return self.automl_.show_models()
  File "automl/lib/python3.7/site-packages/autosklearn/automl.py", line 1355, in show_models
    sio.write("(%f, %s),\n" % (weight, model))
  File "automl/lib/python3.7/site-packages/sklearn/base.py", line 260, in __repr__
    repr_ = pp.pformat(self)
  File "automl/lib/python3.7/site-packages/python3.7/pprint.py", line 144, in pformat
    self._format(object, sio, 0, 0, {}, 0)
  File "automl/lib/python3.7/site-packages/python3.7/pprint.py", line 161, in _format
    rep = self._repr(object, context, level)
  File "automl/lib/python3.7/site-packages/python3.7/pprint.py", line 393, in _repr
    self._depth, level)
  File "automl/lib/python3.7/site-packages/sklearn/utils/_pprint.py", line 181, in format
    changed_only=self._changed_only)
  File "automl/lib/python3.7/site-packages/sklearn/utils/_pprint.py", line 425, in _safe_repr
    params = _changed_params(object)
  File "automl/lib/python3.7/site-packages/sklearn/utils/_pprint.py", line 91, in _changed_params
    params = estimator.get_params(deep=False)
  File "automl/lib/python3.7/site-packages/sklearn/base.py", line 195, in get_params
    value = getattr(self, key)
AttributeError: 'MyDummyClassifier' object has no attribute 'dataset_properties'

Looks like change here is causing the issue. Please help me understand why new params are added here? Let me know if new added params are required. I can submit a fix based on that.