Bug 11476: remove extra empty option from title pull-down in OPAC self-registration

Bug 11476: remove extra empty option from title pull-down in OPAC self-registration

If you have patron titles enabled, the OPAC patron details form lists 2
empty spaces instead of 1. An empty option is passed by the script, so
the template does not need to include one.

To test you must have at least one patron title set in BorrowersTitles
system preference and OPACPatronDetails must be set to "allow."

1. Apply the patch
2. Log in to the OPAC
3. Click the "personal details" tab.
4. Click the "salutation" dropdown. There should be only one blank line
   preceding the existing titles.

Test in both prog and bootstrap.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works as described for existing and creating new accounts.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit a8aa6e8f7efd1ea29fdbd99cf3e573e72b424eb5)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>