validate_no_null_transforms

class ValidateNoNullTransforms(plugin.MayaInstancePlugin,
                               OptionalPyblishPluginMixin):
    """Ensure no null transforms are in the scene.

    Warning:
        Transforms with only intermediate shapes are also considered null
        transforms. These transform nodes could potentially be used in your
        construction history, so take care when automatically fixing this or
        when deleting the empty transforms manually.

    """

    order = ValidateContentsOrder
    families = ['model']
    label = 'No Empty/Null Transforms'
    actions = [RepairAction,
               ayon_maya.api.action.SelectInvalidAction]
    optional = False

    @staticmethod
    def get_invalid(instance):
        """Return invalid transforms in instance"""

        transforms = cmds.ls(instance, type='transform', long=True)

        invalid = []
        for transform in transforms:
            if not has_shape_children(transform):
                invalid.append(transform)

        return invalid

    def process(self, instance):
        """Process all the transform nodes in the instance """
        if not self.is_active(instance.data):
            return
        invalid = self.get_invalid(instance)
        if invalid:
            raise PublishValidationError(
                "Empty transforms found without shapes:\n\n{0}".format(
                    _as_report_list(sorted(invalid))
                ),
                title="Empty transforms"
            )

    @classmethod
    def repair(cls, instance):
        """Delete all null transforms.

        Note: If the node is used elsewhere (eg. connection to attributes or
        in history) deletion might mess up things.

        """
        invalid = cls.get_invalid(instance)
        if invalid:
            cmds.delete(invalid)