[VCS] x.plot(variable) fails with poorly defined bounds

[chaosphere2112]

This issue is reproducible:

>>> type(soAnom)
<class 'cdms2.tvariable.TransientVariable'>
>>> soAnom.shape
(50, 50, 300, 360)
>>> soAnom.getAxisIds()
['time', 'st_ocean', 'yt_ocean', 'xt_ocean']
>>> x = vcs.init()
>>> x.plot(soAnom[0,0,])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/uvcdat/2.4.0rc1/lib/python2.7/site-packages/vcs/Canvas.py", line 2524, in plot
    a = self.__plot(arglist, keyargs)
  File "/usr/local/uvcdat/2.4.0rc1/lib/python2.7/site-packages/vcs/Canvas.py", line 3628, in __plot
    arglist[0] = self._reconstruct_tv(arglist, keyargs)
  File "/usr/local/uvcdat/2.4.0rc1/lib/python2.7/site-packages/vcs/Canvas.py", line 757, in _reconstruct_tv
    mesh = grid.getMesh()
  File "/usr/local/uvcdat/2.4.0rc1/lib/python2.7/site-packages/cdms2/hgrid.py", line 236, in getMesh
    raise CDMSError, 'No boundary data is available for grid %s'%self.id
cdms2.error.CDMSError: No boundary data is available for grid grid_4

Migrated from: https://github.com/UV-CDAT/uvcdat/issues/1590