ApiContext::restore() billing_contract is null resulting in "BunqModel::createFromResponseArray() must be of the type array" error

[RoodFruit]

Steps to reproduce:

1. Create a new bunq json file as a company (UserCompany) using ApiContext::create(.... Using your existing one will not produce the error, since the node billing_contract causing it, is probably not in your json file yet.
2. Run a command to the API. This uses your existing ApiContext by using ApiContext::restore(...
3. Using this restore() will create an error:

   Argument 1 passed to bunq\Model\Core\BunqModel::createFromResponseArray() must be of the type array, null given, called in ...vendor/bunq/sdk_php/src/Model/Core/BunqModel.php on line 254

What should happen

1. Return an empty array for the field billing_contract of UserCompany instead of a null value.

What happens:

1. In your newly created bunq json file is a node called billing_contract like so:

   "billing_contract": [
    null,
    null,
    null
   ],

   Since this is null, the the parser prompts an error resulting in an unusable API.

SDK version and environment

• Tested on 1.14.18
• [X] Production

Dirty workaround

• Manually remove the billing_contract node in your production json and this will work again...

[RoodFruit]

See #206

[RoodFruit]

Bunq fixed the issue in 1.14.2.