Form field for basic array not working

[Alzpeta]

Package version (if known): v2.2.0

Describe the bug

It is impossible to generate a create form containing an array field with primitive data type items. (e.g. List(String()) )

In the array.js file at this line, it is automatically assumed that the array type field definition contains items.properties, which is not true for primitive datatype arrays, as can be seen in marshmallow_utils

Steps to Reproduce

1. Create a model field with List(String()) marshmallow definition
2. Create a new form field in the CreateView for this model field
3. Open the create form in browser