[WWcvs] webwork-modperl: Avoid undefined due_date when problem is viewed from

[dpvc v. a. <we...@ma...>]

Log Message:
-----------
Avoid undefined due_date when problem is viewed from the library
browser.

Modified Files:
--------------
    webwork-modperl/lib/WeBWorK/ContentGenerator:
        Problem.pm

Revision Data
-------------
Index: Problem.pm
===================================================================
RCS file: /webwork/cvs/system/webwork-modperl/lib/WeBWorK/ContentGenerator/Problem.pm,v
retrieving revision 1.181
retrieving revision 1.182
diff -Llib/WeBWorK/ContentGenerator/Problem.pm -Llib/WeBWorK/ContentGenerator/Problem.pm -u -r1.181 -r1.182
--- lib/WeBWorK/ContentGenerator/Problem.pm
+++ lib/WeBWorK/ContentGenerator/Problem.pm
@@ -181,7 +181,7 @@
 	$ce->{pg}->{options}->{showOldAnswers} = 0
 		unless ($authz->hasPermissions($userName, "can_show_old_answers_by_default"));
 	# we are after the due date, so default to not showing it
-	$ce->{pg}->{options}->{showOldAnswers} = 0 if after($set->{due_date});
+	$ce->{pg}->{options}->{showOldAnswers} = 0 if $set->{due_date} && after($set->{due_date});
 }
 
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