Determining incomplete sections in Javascript object

I have a Javascript object with a few sections; namely, banking,fitment,personal_info,vehicle.

The object is structured as follows:

{
  banking: {
    account_number: null,
    account_type: null,
    bank_name: null,
    debit_day: null
  },
  fitment: {
    date: null,
    terms: null
  },
  personal_info: {
    email: null,
    IDNumber: null,
    mobile: null,
    name: null,
    residential_address: null,
    surname: null,
    title: null,
    work_address: null,
    work_tel: null
  },
  vehicle: {
    brand: null,
    colour: null,
    model: null,
    registration: null,
    vin: null,
    year: null
  }
}

By default, all values within the object and its “nested sections” have a value of null.

I’m trying to figure out a way to categorize the sections into 3 different categories, namely:
empty, partial and complete.

“empty” being a case that all values within a section are set as null.

“partial” being that some values within a section have been set (not all null)

“complete” being that no values within a section are set to null. All have values.

My first attempt was with utilizing the Underscore library with _.some(), however I can’t seem to wrap my head around catering for all 3 category scenarios.

Some help and guidance will be much appreciated.

Thanks!