Fix some of the most obvious bugs in fact generation from Maniphest tasks
Fix some of the most obvious issues with fact generation:
- No more 0-point facts.
- Engine can now generate at least one of every type of fact.
Test Plan: Generated facts, viewed them in the debugging view, fact generation largely appeared to align with reality. No more "no facts in storage" facts.
Maniphest Tasks: T13083
Differential Revision: https://secure.phabricator.com/D19122