With a snapcraft.yaml as follows: ``` name: fail-tester version: git version: 0.1 summary: A Snap that fails in configurable ways description: >   This snap is useful for testing snap hooks.   By setting configuration on the snap, one can control which hooks will fail. grade: devel # must be 'stable' to release into candidate/stable channels confinement: devmode # use 'strict' once you have the right plugs and slots parts: ``` snapcraft fails but with a strange message: Issues while validating snapcraft.yaml: The 'parts' property does not match the required schema: <ValidationError: "None is not of type 'object'"> is not a valid part name. Part names consist of lower-case alphanumeric characters, hyphens, plus signs, and forward slashes. As a special case, 'plugins' is also not a valid part name.