build() can throw a NullpointerException when using box classes

[Adrodoc]

The generated build method for a Pojo with a box class paramater in the constructor/factory method will throw a NullPointerException if no value was set. This only occurs when using withBuilderProperties = true.

Example:

public class Pojo {
  private Double value;

  @GeneratePojoBuilder(withBuilderProperties = true, withBuilderInterface = Builder.class)
  public Pojo(Double value) {
    this.value = value;
  }

  public Double getValue() {
    return value;
  }

  public static void main(String[] args) {
    NullPointerException act = null;
    try {
      new PojoBuilder().build();
    } catch (NullPointerException ex) {
      act = ex;
    }
    assert act != null;
  }
}