NameError: global name 'CubesError' is not defined in Slicer

[ramilexe]

Create model with missing join. Run slicer test and you get

testing my_cube: Traceback (most recent call last):
  File "/usr/local/bin/slicer", line 9, in <module>
    load_entry_point('cubes==1.1', 'console_scripts', 'slicer')()
  File "/home/vagrant/cubes/cubes/slicer/commands.py", line 622, in main
    cli(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 664, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 644, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 991, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 837, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 464, in invoke
    return callback(*args, **kwargs)
  File "/home/vagrant/cubes/cubes/slicer/commands.py", line 282, in test
    except CubesError as e:
NameError: global name 'CubesError' is not defined