Bug 344448: editparams.cgi doesn't let me clear a group - Patch by Frédéric…

Bugzilla/Config/Common.pm

@@ -154,6 +154,7 @@ sub check_opsys {
 
 sub check_group {
     my $group_name = shift;
+    return "" unless $group_name;
     my $group = new Bugzilla::Group({'name' => $group_name});
     unless (defined $group) {
         return "Must be an existing group name";

Bugzilla/Config/GroupSecurity.pm

@@ -94,6 +94,7 @@ sub get_param_list {
 
 sub _get_all_group_names {
     my @group_names = map {$_->name} Bugzilla::Group::get_all_groups();
+    unshift(@group_names, '');
     return \@group_names;
 }
 1;