3845 Don't print empty ul when there are no recipients, parents, or claims

https://code.google.com/p/otwarchive/issues/detail?id=3845

Empty elements are bad. We don't want the associations ul around when it contains nothing. Used to be https://github.com/otwcode/otwarchive/pull/1436 until I accidentally deleted it while cleaning up my branches because it split off from another issue number.