Summary:
We can detect certain kinds of contradictions sooner,
producing a token with an unresolvable Predicate is wasteful.
For a text like:
```
"Demain apres midi 14h 15 h 16h vendredi 14 a 15h"
```
it could produce 7000 tokens with empty predicates.
After this change it produces none and we get a 4x improvement in
time and 6x improvement in allocations.
Note I only covered `ruleIntersect*` here. I need to do this for
other instances as well.
Reviewed By: JonCoens
Differential Revision: D4871078
fbshipit-source-id: 9f0e7ad
3d18cf5ea9