Grid does not bind all of the form fields

[knjk04]

Describe the bug

The book form no longer populates all (but the shelf) field when a grid item is selected. Only the title and the author's first name is bound (see screenshot)

To Reproduce
Steps to reproduce the behaviour:

1. Choose a shelf
2. Select a grid item
3. See error

Expected behaviour

The form should get populated with all of the fields as in the grid (apart from the shelf for now).

Screenshots

Additional context

Branch: ui

[knjk04]

Null pointer exception if the author's last name is included.

The other fields are bound when the author's last name binding is commented out:

binder.forField(authorLastName)
        .withConverter(new StringToAuthorLastNameConverter())
        .bind(Book::getAuthor, Book::setAuthor);

More specifically, the author's last name is null (see convertToPresentation() in StringToAuthorLastNameConverter.java):

[knjk04]

Blocked by issue #30