The Java console keeps showing up error reports due to being asked

to resize the puzzle to zero size. Ignore all such requests, in the
assumption that a more sensible resize will be along soon enough
(which does seem to happen, though I haven't debugged the NestedVM
front end hard enough to figure out why the bogus resizes happen in
the first place).

git-svn-id: svn://svn.tartarus.org/sgt/puzzles@8094 cda61777-01e9-0310-a592-d414129be87e