Handle missing top-level jsonSchema.properties in objectify()

[alex-all3dp]

If the jsonSchema of an Objection model does not contain a top-level properties field, objectify() will currently fail with errors like Cannot read property 'MyModel.id' of undefined. This happens for instance when the count query after a create operation is executed.

Example schema:

{
      type: 'object',
      allOf: [
        { 
           properties: { id: {type: 'string' }
        },
        {...}
    ]
}

The proposed sanity check allows to gracefully support JSON schemas that have use schema combination via anyOf, allOf etc. at the top-level

[dekelev]

Thanks @alex-all3dp , it's released in v7.1.7