Fixes bug 970406 - pull ADI/blocklist pings from Hive with crontabber

This job fetches ADI aggregates daily from Hive using a SQL query. Many thanks to @peterbe and @lars for help with the mocking, which proved to be daunting.
```
>>> v = None
>>> str(v)
'None'
```
So there's no need to do that inline if statement.