* Modify welcome notification generator to handle errors per-message
The original flow aborted all processing when any
ActiveRecord::RecordNotFound exception was raised. This causes a
situation where a missing broadcast message (by title) causes that
notification message to fail, and each day the same failure to
occur (since it wasn't successfully sent the day before), blocking all
further messages.
We want these to proceed on the schedule implicit in the checks, and
failing early prevents that.
Modify the error handling to catch RecordNotFound on each message, and
continue throught the checks until a notification is enqueued or all
checks have been attempted.
* Run welcome broadcast check 4 hours after the user was created
This started to fail when I modified the generator (why? because the
user was 7 days old and _other_ notifications would be sent).
Ensure the user is 4 hours old before checking that the disabled
welcome broadcast message is checked, and not sent.
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