Bug 28213: Prevent crash if patron or club deleted after search to hold

Deleting a patron or patron club causes server error on searching.

To recreate:
- create a club template
- create a club
- enroll a patron in the club
- from the clubs page, select Search To Hold for your club
- do a search, see that it says "Hold for [club name]" in your search results page
- go back to the clubs page and delete your club
- try to perform a search
=> Without this patch you get "Can't call method "name" on an undefined value at /kohadevbox/koha/catalogue/search.pl line 207"

Same when placing a hold for a patron (check the search result and the
detail pages)

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

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

catalogue/detail.pl

@@ -92,15 +92,17 @@ if ( not defined $record ) {
 eval { $biblio->metadata->record };
 $template->param( decoding_error => $@ );
 
-if($query->cookie("holdfor")){ 
+if($query->cookie("holdfor")){
     my $holdfor_patron = Koha::Patrons->find( $query->cookie("holdfor") );
-    $template->param(
-        # FIXME Should pass the patron object
-        holdfor => $query->cookie("holdfor"),
-        holdfor_surname => $holdfor_patron->surname,
-        holdfor_firstname => $holdfor_patron->firstname,
-        holdfor_cardnumber => $holdfor_patron->cardnumber,
-    );
+    if ( $holdfor_patron ) {
+        $template->param(
+            # FIXME Should pass the patron object
+            holdfor => $query->cookie("holdfor"),
+            holdfor_surname => $holdfor_patron->surname,
+            holdfor_firstname => $holdfor_patron->firstname,
+            holdfor_cardnumber => $holdfor_patron->cardnumber,
+        );
+    }
 }
 
 if($query->cookie("searchToOrder")){

catalogue/search.pl

@@ -194,20 +194,24 @@ if (C4::Context->preference("marcflavour") eq "UNIMARC" ) {
 
 if($cgi->cookie("holdfor")){ 
     my $holdfor_patron = Koha::Patrons->find( $cgi->cookie("holdfor") );
-    $template->param(
-        holdfor => $cgi->cookie("holdfor"),
-        holdfor_surname => $holdfor_patron->surname,
-        holdfor_firstname => $holdfor_patron->firstname,
-        holdfor_cardnumber => $holdfor_patron->cardnumber,
-    );
+    if ( $holdfor_patron ) { # may have been deleted in the meanwhile
+        $template->param(
+            holdfor => $cgi->cookie("holdfor"),
+            holdfor_surname => $holdfor_patron->surname,
+            holdfor_firstname => $holdfor_patron->firstname,
+            holdfor_cardnumber => $holdfor_patron->cardnumber,
+        );
+    }
 }
 
 if($cgi->cookie("holdforclub")){
     my $holdfor_club = Koha::Clubs->find( $cgi->cookie("holdforclub") );
-    $template->param(
-        holdforclub => $cgi->cookie("holdforclub"),
-        holdforclub_name => $holdfor_club->name,
-    );
+    if ( $holdfor_club ) { # May have been deleted in the meanwhile
+        $template->param(
+            holdforclub => $cgi->cookie("holdforclub"),
+            holdforclub_name => $holdfor_club->name,
+        );
+    }
 }
 
 if($cgi->cookie("searchToOrder")){