When a field with a Schema is `optional: true`, then validation fails

[scharf]

Given this code:

import SimpleSchema from 'simpl-schema';

const SubSchema = new SimpleSchema({
    field: {
        type: String,
    },
});

const MainSchema = new SimpleSchema({
    parent: {
        type: SubSchema,
        optional: true,
    },
});

// Validate an empty object
MainSchema.validate({});

I get the following error:

{
  errorType: 'ClientError',
  error: 'validation-error',
  details: [
    {
      name: 'parent.field',
      type: 'required',
      value: undefined,
      message: 'Field is required'
    }
  ]
}

I would not expect to see any errors because parent is optional.

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[scharf]

duplicate of #475