handle the request subject being undef

diff --git a/Debbugs/Control.pm b/Debbugs/Control.pm
index a89a7eb7386594c888bb55e71fddf2291390f1b5..c0c835bad98e0f4b85136f0647852fb2b4df4464 100644 (file)
--- a/Debbugs/Control.pm
+++ b/Debbugs/Control.pm
@@ -996,7 +996,7 @@ sub set_done {
                                                             headers =>
                                                             [To => $data->{submitter},
                                                              Subject => "$config{ubug}#$data->{bug_num} ".
-                                                             "closed by $param{requester} ($param{request_subject})",
+                                                             "closed by $param{requester} ".(defined $param{request_subject}?"($param{request_subject})":""),
                                                             ],
                                                            )
                                            ],