Bugfix, taking into account neutrals in the B final state

In my original implementation I did not take into account that the B decay can have daughters that are neutral. This lead to a nullptr when calling track() and a subsequent segfault.

@jhorswil can we get this tested, the change is tiny and should have no effect on any test.

added RTA label

/ci-test

added ci-test-triggered label

• [2023-03-10 16:33] Validation started with lhcb-master-mr#7287

resolved all threads

approved this merge request

merged

mentioned in commit 46d4e4ba