handle geolocation database download failure better

[diosmosis]

Currently if the geolocation DB download scheduled task fails, the following occurs:

• a fatal error is thrown, resulting in an email being sent and possibly all scheduled tasks being aborted
• the download is not rescheduled to a future date, so the next archiving run just tries again, which can fail, resulting in another email being sent

Instead, if the download fails, we should avoid a fatal, and make sure we only try again the next day.

Refs #1110