On the bugs webpage the email is visible only to logged-in users. See it for yourself: https://bugs.freedesktop.org/show_bug.cgi?id=31853
And no, bug report without a possibility to reach back to the original reporter usually are a waste of time. If nobody else can reproduce it and nobody can even check a few years down from now if it’s still a problem. The same goes with reporters who just don’t respond.
So really, bug reports with no email are too often useless. What should you do? If your email really is top secret (don’t worry, it’s not), you could create another email which only forwards mail when it passes your filters (e.g forward only mail which contains freedesktop or libreoffice in it).