message: Do not hide exceptions
  I'm doing this mainly as the test coverage is failing to cover those
  lines and I don't see an easy way to cover them. However it also seems
  better to bubble up such errors rather than hide them.
diff: @@ -152,12 +152,7 @@ export default class ReaderModel {
  let record;
  let prefixLength;
  - try {
  [record, prefixLength] = this.mmdbReader.getWithPrefixLength(ipAddress);
  - } catch {
  - record = undefined;
  - prefixLength = undefined;
  - }
  if (!record) {
  throw new AddressNotFoundError(
  