Follow-up from "feat: IBD cross section of the 1 order, add plotting functions"

The following discussion from !31 (merged) should be addressed:

• @tsegelnik started a discussion:

  I think in order to avoid problems with type annotations due to the possibility of field values with None, it is better to throw an exception when trying to call the getter if the value is not set. Then all types of fields will be uniquely defined and we avoid Optionals. The comment is not for this request, but more to think about in the future.