Bug 27729: Fix use of grep and split in CheckReserves

A few lines of code were added to CheckReserves containing the wrong
use of two perl functions: grep and split on bug 25232.
A test was added even making these things pass.

Test plan:
Run t/db../Holds.t

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

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

C4/Reserves.pm

@@ -831,8 +831,8 @@ sub CheckReserves {
     # if item is not for loan it cannot be reserved either.....
     # except where items.notforloan < 0 :  This indicates the item is holdable.
 
-    my @SkipHoldTrapOnNotForLoanValue = split( '|', C4::Context->preference('SkipHoldTrapOnNotForLoanValue') );
-    return if @SkipHoldTrapOnNotForLoanValue && grep( $notforloan_per_item, @SkipHoldTrapOnNotForLoanValue );
+    my @SkipHoldTrapOnNotForLoanValue = split( '\|', C4::Context->preference('SkipHoldTrapOnNotForLoanValue') );
+    return if grep { $_ eq $notforloan_per_item } @SkipHoldTrapOnNotForLoanValue;
 
     my $dont_trap = C4::Context->preference('TrapHoldsOnOrder') ? ($notforloan_per_item > 0) : ($notforloan_per_item && 1 );
     return if $dont_trap or $notforloan_per_itemtype;