Same issue with mine. When I get around to it, I'm just going to cut a new tab into the metal using a dremel or wiresaw blade and gently bend the new tab to accept the ground wire. I think there is enough wire to reach the new tab.
I had a post last July about this exact same issue (Correction, not December as I stated in the Vday thread that will not die...
) and this was one of the options suggested. Given the other options, I think that is probably the most expedient manner.
Others reported mixed results with soldering the errant tab back on, btw.