K 10 svn:author V 6 emaste K 8 svn:date V 27 2014-10-20T03:17:48.768737Z K 7 svn:log V 245 MFS10 r273296 (r273219 in HEAD): Do nothing in vt_upgrade if there is no vt driver Previously, if no drivers attached at boot we would panic with "vtbuf_fill_locked begin.tp_row 0 must be < screen height 0". PR: 192248 Approved by: re END