Add empty values into result data

[irrbd]

The result object doesn't have any key-value couples with an empty string value.
So we can't change old values for empty values simply if we use a general component with the Form-component.

[irrbd]

The example of a scheme:

{
 type: 'object',
 properties: {
   middle_name: {
     type: 'string',
     title: 'Отчество',
   },
 },
}

The resulted object for this scheme after update for the version 1.2.6:

{ 
  middle_name: null
}

The resulted object for this scheme after update for the version 1.3.1:

{ 
  middle_name: undefined
}

The problem
The example of a scheme:

{
  type: 'object',
  properties: {
     has_processing_unit: {
      title: 'Есть отдел обработки',
      type: 'toggle',
    },
  },
}

The resulted object if we change the true-value to the false-value for the version 1.2.6:

{ 
  has_processing_unit: null
}

The resulted object if we change the true-value to the false-value for the version 1.3.1:

{ 
  has_processing_unit: undefined
}

[VitaliyMatveev]

@irrbd I don't understand what you expecting