Description
We are mostly ignoring errors and throwing around bare asserts. We should do proper error handling.
Desired behavior/Acceptance criteria (returned value, expected error, performance expectations, etc.)
- just good, clean errors
Completion checklist
- Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Back-end_Task/Bug_completion_checklist