Bug 10240: (follow-up) don't display patrons as lost or gone-no-address incorrectly

Bug 10240: (follow-up) don't display patrons as lost or gone-no-address incorrectly

Because borrowers.lost and borrowers.gonenoaddress are nullable, when
downloading patron information for an offline patron sync, convert null
values to zero.

To test:

[1] Set borrowers.lost to NULL for a patron.
[2] Do an offline sync, then disconnect network access (or
    stop the webserver) and enter the offline interface.
[3] Try checking out to the test patron.  A warning will
    (incorrectly) disply stating that the patron's card is lost.
[4] Apply the patch.
[5] Do steps 2 and 3 again.  This time, there will be lost card
    warning.

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