Better error text

Moon experienced these two issues:

1. Population bars loaded but assignments did not load onto the map
2. Healing behavior did not work on fully painted district children

These are possibly frontend or backend issues.

Frontend explanations: Data loading in an order we did not account for or potential missing edge case

Backend: Long duration or failed db call to get assignments, shattered children

We should add some better error handling and text on the frontend to more clearly track problems