I'm not sure if this is a bug as I can replicate the problem...which is odd because I'm using 2.77 which isn't a beta version as far as I know. I've tried researching but haven't come up with much. It'd be faster to simply remake the mesh, but I'm curious since I can replicate the problem but can't find a similar question.
1- Enabled X-mirror and Topology mirror in Editmode
2- Selected all vertices and pressed "G"
3- Mesh disappears
The object origin is still visible in 3D view.
The object is still existent in Outliner
The object is not hidden in Outliner.
"Alt H" does nothing in 3D view (object not hidden by "H")
The view is not in local view.
“View selected” responds and zooms to object origin dot.