Fix ConditionalHandler value checks

[elbakerino]

Current Behavior

Currently the ConditionalHandler fails to validate nested objects - if there are no default values inside of the nested object. Thus some else will never be applied, as the if is never evaluated.

Expected Behavior

Not checking for existance of object - and also evaluating it for other types than for object.

Steps to Reproduce

e.g. in this schema the if/then/else is not evaluated without the default for the boolean, the default creates the parent object in the store values and only than it works as expected:

const schema = {
    type: 'object',
    properties: {
        file: {
            type: 'string',
            widget: 'FileUpload',
        },
        name: {
            type: 'object',
            properties: {
                value: {
                    type: 'string',
                    title: 'Name',
                    view: {
                        sizeMd: 10,
                    },
                },
                custom: {
                    type: 'boolean',
                    default: false, // if this `default` does not exist, the `else` will not be applied
                },
            },
            allOf: [
                {
                    if: {
                        properties: {
                            custom: {
                                const: true,
                            },
                        },
                    },
                    then: {
                        properties: {
                            value: {},
                        },
                    },
                    else: {
                        properties: {
                            value: {
                                widget: 'Select',
                                enum: ['steel', 'metal', 'earth'],
                            },
                        },
                    },
                },
            ],
        },
    },
}

For non object this is valid, but not evaluated at all currently:

{
  "type": "integer",
  "if": {
    "minimum": 4
  },
  "then": {
    "multipleOf": 2
  }
}

Your Environment

Tech	Version
UI-Schema	v0.4.3

[elbakerino]

Released with ui-schema@0.4.4