KRACOEUS-7999: Stack trace when trying to view undisclosed Events

More instances where I converted lookups to DataObjectService, for fetching DevelopmentProposal and ProposalPerson objects.
But broken is broken. MIT has millions of PropDev docs, so this code is almost as broken for them as it was before. And in this use case, which is for COI events, if we ever returned every proposal in the system as an undisclosed event it would be distinctly incorrect. And in this use case, simply returning an empty list is exactly what we should do and will work fine. This instance isn't a 2-step process where other criteria are at play. Its only trying to build a list for the logged in user.