isofill broken for discontinued

[doutriaux1]

import vcs
import os,sys
import cdms2


f=cdms2.open(os.path.join(vcs.sample_data,"clt.nc"))

s=f("clt")

x=vcs.init()

iso = x.createisofill()

iso.levels = [[0,10],[20,30],[40,60],[80,100]]

x.plot(s,iso)

raw_input("press enter")

leads to:

Traceback (most recent call last):
  File "/git/uvcdat/testing/vcs/test_not_contiguous.py", line 16, in <module>
    x.plot(s,iso)
  File "/lgm/uvcdat/2015-12-07/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/vcs/Canvas.py", line 2417, in plot
    a = self.__plot(arglist, keyargs)
  File "/lgm/uvcdat/2015-12-07/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/vcs/Canvas.py", line 3740, in __plot
    returned_kargs = self.backend.plot(*arglist, **keyargs)
  File "/lgm/uvcdat/2015-12-07/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/vcs/VTKPlots.py", line 528, in plot
    vtk_backend_grid, vtk_backend_geo))
  File "/lgm/uvcdat/2015-12-07/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/vcs/vcsvtk/pipeline2d.py", line 246, in plot
    self._updateContourLevelsAndColors()
  File "/lgm/uvcdat/2015-12-07/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/vcs/vcsvtk/isofillpipeline.py", line 68, in _updateContourLevelsAndColors
    self._contourColors = vcs.getcolors(levs2, split=0)
UnboundLocalError: local variable 'levs2' referenced before assignment

Apparently @dlonie did forsee this 😉 https://github.com/UV-CDAT/uvcdat/blob/master/Packages/vcs/Lib/vcsvtk/isofillpipeline.py#L67-Lundefined

[doutriaux1]

@aashish24 @sankhesh @danlipsa @chaosphere2112 this is an important new issue