[COPA] Handle new case for log_no collisions

[tw-jeff-burroughs]

The new case here is that it's possible to have a new row from the scraped COPA data like this:

log_no, beat, complaint_date
1234, 12, 2018-09-19

with a matching DB row that looks like this:
cr_id | beat_id | incident_date
1234 | None | None

final DB row should look like this:
cr_id | beat_id | incident_date
1234 | 12 | 2018-09-19

In this case the DB row should be updated to include the new information and a report describing this action created and saved under errors/updated_rows.csv