Checkbox validation is not working with version 1.0-alpha4

[warmy1004]

Enhancement

Validating a checkbox is not working.

How to reproduce:

1. Select Yes for the first question
2. click 'Validate' button

Expected behaviour

I expected 'Required' error message is displayed on the screen for the last question, checkbox one

Actual behaviour

It actually no error message is pop up and it's in a success stage instead of an error stage. The color is changed to green which means it's in a success stage.

Gist/Plunker/Demo

[Description]https://plnkr.co/edit/GpmbaMPZmtgofOdV0Fye?p=preview

@json-schema-form/angular-schema-form-lead

[Anthropic]

@warmy1004 your issue is actually resulting from something that was fixed, the previous behaviour was actually causing errors.

Add "enum": [ true ] to the schema to get the behaviour you are needing.