Don't let missing checkboxes (because of missing sections) disable

the contact copying.
 - Legacy-Id: 679

Author: fenner

ietf/templates/ipr/js.html

@@ -4,7 +4,8 @@
     if (src == 'holder') {
 	checked = document.form1.hold_contact_is_submitter.checked;
 	if (checked) {
-	    document.form1.ietf_contact_is_submitter.checked = false;
+	    if (document.form1.ietf_contact_is_submitter)
+		document.form1.ietf_contact_is_submitter.checked = false;
 	    document.form1.subm_name.value = document.form1.hold_name.value;
 	    document.form1.subm_title.value = document.form1.hold_title.value;
 	    document.form1.subm_department.value = document.form1.hold_department.value;
@@ -26,7 +27,8 @@
     } else if (src == 'ietf') {
 	checked = document.form1.ietf_contact_is_submitter.checked;
 	if (checked) {
-	    document.form1.hold_contact_is_submitter.checked = false;
+	    if (document.form1.hold_contact_is_submitter)
+		document.form1.hold_contact_is_submitter.checked = false;
 	    document.form1.subm_name.value = document.form1.ietf_name.value;
 	    document.form1.subm_title.value = document.form1.ietf_title.value;
 	    document.form1.subm_department.value = document.form1.ietf_department.value;