[python] Fix map of array in property (#15844)

* fix map of array in property (python)

* update samples

samples/openapi3/client/petstore/python/test/test_map_of_array_of_model.py

@@ -0,0 +1,60 @@
+# coding: utf-8
+
+"""
+    OpenAPI Petstore
+
+    This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\  # noqa: E501
+
+    The version of the OpenAPI document: 1.0.0
+    Generated by OpenAPI Generator (https://openapi-generator.tech)
+
+    Do not edit the class manually.
+"""
+
+
+import unittest
+import datetime
+
+import petstore_api
+from petstore_api.models.map_of_array_of_model import MapOfArrayOfModel  # noqa: E501
+from petstore_api.rest import ApiException
+
+class TestMapOfArrayOfModel(unittest.TestCase):
+    """MapOfArrayOfModel unit test stubs"""
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def make_instance(self, include_optional):
+        """Test MapOfArrayOfModel
+            include_option is a boolean, when False only required
+            params are included, when True both required and
+            optional params are included """
+        # uncomment below to create an instance of `MapOfArrayOfModel`
+        """
+        model = petstore_api.models.map_of_array_of_model.MapOfArrayOfModel()  # noqa: E501
+        if include_optional :
+            return MapOfArrayOfModel(
+                shop_id_to_org_online_lip_map = {
+                    'key' : [
+                        petstore_api.models.tag.Tag(
+                            id = 56, 
+                            name = '', )
+                        ]
+                    }
+            )
+        else :
+            return MapOfArrayOfModel(
+        )
+        """
+
+    def testMapOfArrayOfModel(self):
+        """Test MapOfArrayOfModel"""
+        # inst_req_only = self.make_instance(include_optional=False)
+        # inst_req_and_optional = self.make_instance(include_optional=True)
+
+if __name__ == '__main__':
+    unittest.main()