Bug 16707: Fix software error in OPAC password recovery when leaving form fields empty

The $search_results is considered as an arrayref but is not defined if
no patron matches the recovery infos.

Test plan:
- Set syspref OpacResetPassword to "Allow"
- Go to OPAC
- Click link "Forgot your password?
- On the following screen "Forgotten password recovery", do not fill in
  form fields, click "Submit"
=> Without this patch you got the software error
=> With this patch apply, you will get "No account was found with the
provided information."

Sign-off on counter patch.
Signed-off-by: Marc Véron <veron@veron.ch>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>

opac/opac-password-recovery.pl

@@ -54,7 +54,7 @@ if ( $query->param('sendEmail') || $query->param('resendEmail') ) {
     #try with the main email
     $email ||= '';    # avoid undef
     my $borrower;
-    my $search_results;
+    my $search_results = [];
 
     # Find the borrower by his userid or email
     if ($username) {