Bug 16029: Hide patron toolbar if patron does not exist

Bug 16029: Hide patron toolbar if patron does not exist

To test:
1) Create a patron, take note of the borrower number
2) Delete the patron
3) Navigate to the page of the patron you just deleted by typing the url (ie /cgi-bin/koha/members/moremember.pl?borrowernumber=X)
4) Confirm that the patron toolbar is not showing on the page
5) The message now has a link that says 'Find another patron?'. Click this link and confirm you are taken to the member home pgae.

Sponsored-by: Catalyst IT

Followed test plan, works as expected.
Signed-off-by: Marc Véron <veron@veron.ch>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com
(cherry picked from commit 1870141874667d854f9b5508c563169baefb2328)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>