A bunch of fixes to get things to actually work on toby.

Some are bug-fixes: json.load -> json.loads

Some are unexpected-data fixes: bigquery can give back None for some
string entries.

Some are sql debugging: 'Delete' is a sql keyword so we can't use it
as a variable name.

And finally, I just send these reports to infrastructure-blackhole
rather than infrastructure-blackhole+<something>, since our blackhole
email filters don't work well with the '+'.  To make up for it, you
could easily add another filter based on the 'From'.

Auditors: chris

Test plan:
Ran successfully on toby