[Python] Bug in generated api_client for Python generator

Description

The generator appears to be messing up the generation of the sanitize_for_serialization method inside of api_client. The last if statement block is indented an extra 4 spaces than it should be.

Swagger-codegen version

Not sure where to find this. I'm using the one currently available inside of SwaggerHub

Suggest a fix/enhancement

Current:

    def sanitize_for_serialization(self, obj):
        """Builds a JSON POST object.

        If obj is None, return None.
        If obj is str, int, long, float, bool, return directly.
        If obj is datetime.datetime, datetime.date
            convert to string in iso8601 format.
        If obj is list, sanitize each element in the list.
        If obj is dict, return the dict.
        If obj is swagger model, return the properties dict.

        :param obj: The data to serialize.
        :return: The serialized form of data.
        """
        if obj is None:
            return None
        elif isinstance(obj, self.PRIMITIVE_TYPES):
            return obj
        elif isinstance(obj, list):
            return [self.sanitize_for_serialization(sub_obj)
                    for sub_obj in obj]
        elif isinstance(obj, tuple):
            return tuple(self.sanitize_for_serialization(sub_obj)
                for sub_obj in obj)
        elif isinstance(obj, (datetime.datetime, datetime.date)):
            return obj.isoformat()

            if isinstance(obj, dict):
                obj_dict = obj
            else:
                # Convert model obj to dict except
                # attributes `swagger_types`, `attribute_map`
                # and attributes which value is not None.
                # Convert attribute name to json key in
                # model definition for request.
                obj_dict = {obj.attribute_map[attr]: getattr(obj, attr)
                        for attr, _ in six.iteritems(obj.swagger_types)
                            if getattr(obj, attr) is not None}

            return {key: self.sanitize_for_serialization(val)
                for key, val in six.iteritems(obj_dict)}

Expected:

    def sanitize_for_serialization(self, obj):
        """Builds a JSON POST object.

        If obj is None, return None.
        If obj is str, int, long, float, bool, return directly.
        If obj is datetime.datetime, datetime.date
            convert to string in iso8601 format.
        If obj is list, sanitize each element in the list.
        If obj is dict, return the dict.
        If obj is swagger model, return the properties dict.

        :param obj: The data to serialize.
        :return: The serialized form of data.
        """
        if obj is None:
            return None
        elif isinstance(obj, self.PRIMITIVE_TYPES):
            return obj
        elif isinstance(obj, list):
            return [self.sanitize_for_serialization(sub_obj)
                    for sub_obj in obj]
        elif isinstance(obj, tuple):
            return tuple(self.sanitize_for_serialization(sub_obj)
                for sub_obj in obj)
        elif isinstance(obj, (datetime.datetime, datetime.date)):
            return obj.isoformat()

        if isinstance(obj, dict):
            obj_dict = obj
        else:
            # Convert model obj to dict except
            # attributes `swagger_types`, `attribute_map`
            # and attributes which value is not None.
            # Convert attribute name to json key in
            # model definition for request.
            obj_dict = {obj.attribute_map[attr]: getattr(obj, attr)
                    for attr, _ in six.iteritems(obj.swagger_types)
                        if getattr(obj, attr) is not None}

        return {key: self.sanitize_for_serialization(val)
            for key, val in six.iteritems(obj_dict)}

Locate the Python generator template or entry point that emits api_client.sanitize_for_serialization; the issue does not name a repository file or test. Compare generated output with the expected example, then verify that the dict/model handling block and final return are at the shown indentation.