Bug 11404: (follow-up) only ask user if there are instances needing upgrading

Bug 11404: (follow-up) only ask user if there are instances needing upgrading

There's no point asking the user if they want their Apache Koha
configuration updated if there's no configuration needing updated.

This also fixes a case where the updating would have failed when running
on Apache 2.4.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
I agree with adding that checks, and the conditions rewrite seems cleaner
than my first approach. So, I sign it.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>