Avoid an undef warning when comparing below

lib/RT/Extension/SLA/Test.pm

@@ -2,7 +2,7 @@ use strict;
 use warnings;
 
 ### after: use lib qw(@RT_LIB_PATH@);
-use lib qw(/opt/rt4/local/lib /opt/rt4/lib);
+use lib qw(/home/tom/work/bps/rt/local/lib /home/tom/bps/rt/lib);
 
 package RT::Extension::SLA::Test;
 

t/ignore-on-statuses.t

@@ -33,6 +33,7 @@ note 'check that reply to requestors dont unset due date with KeepInLoop';
         ok $id, "created ticket #$id";
         is $ticket->FirstCustomFieldValue('SLA'), '2', 'default sla';
         ok !$ticket->DueObj->Unix, 'no response deadline';
+        $due = 0;
     }
 
     # non-requestor reply