Incorrectly raised Error in part.instance()

[raduiordache]

The code looks like this:

    def instance(self):
        """
        Retrieve the single (expected) instance of this 'Part' (of `Category.MODEL`) as a 'Part'.

        See `Part.instances()` method for documentation.

        :return: pykechain.models.Part
        :raises: NotFoundError, MultipleFoundError
        """
        instances_list = list(self.instances())
        if len(instances_list) == 1:
            return instances_list[0]
        else:
            raise MultipleFoundError("Part {} has more than a single instance. "
                                     "Use the `Part.instances()` method".format(self.name))

It should look something like this:

    def instance(self):
        """
        Retrieve the single (expected) instance of this 'Part' (of `Category.MODEL`) as a 'Part'.

        See `Part.instances()` method for documentation.

        :return: pykechain.models.Part
        :raises: NotFoundError, MultipleFoundError
        """
        instances_list = list(self.instances())
        if len(instances_list) == 1:
            return instances_list[0]
        elif len(instances_list) > 1:
            raise MultipleFoundError("Part {} has more than a single instance. "
                                     "Use the `Part.instances()` method".format(self.name))
       elif len(instances_list) < 1:
            raise NotFoundError("Part {} has no instance. "
                                     "Use the `Part.instances()` method".format(self.name))

[raduiordache]

For parts that have multiplicity '0 or x'

[jberends]

in 1.12.7