Request: throw out null addresses

[yinleon]

Some addresses on open addresses don't actually have number or street.

We should check if those exist, and throw them out during the data loading and indexing stage.

[jnu]

Only hesitation is that I want to figure out why they are missing. If it's missing from OA then sure, we can toss it. But it might be missing due to an error in our processing, in which case we should fix the underlying error.