From: Jeff Walden <jwalden@mit.edu>

Don't throw an exception when intercepting a reply to a bug change that doesn't contain a comment.

diff --git a/content/overlay.js b/content/overlay.js
--- a/content/overlay.js
+++ b/content/overlay.js
@@ -47,8 +47,9 @@ var BugzillaReply = {
 
         let account = header.recipients;
         let body = BugzillaReply.getMessageBody(header);
-        let [bug, number, comment] = BugzillaReply.getComment(body);
-        if (comment) {
+        let commentDetails = BugzillaReply.getComment(body);
+        if (commentDetails) {
+          let [bug, number, comment] = commentDetails;
           BugzillaReply.openReply(bug, number, comment);
           return true;
         }