json parsing error when /etc/utah/config is empty

[Javier Collado]

Using the latest revision of the code in the dev branch, I get the following problem when running run_utah_tests.py

  File "/usr/lib/python2.7/dist-packages/utah/config.py", line
    CONFIG.update(json.load(open(myfile)))
  File "/usr/lib/python2.7/json/__init__.py", line 280, in load
    **kw)
  File "/usr/lib/python2.7/json/__init__.py", line 328, in load
    return _default_decoder.decode(s)
  File "/usr/lib/python2.7/json/decoder.py", line 365, in decod
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python2.7/json/decoder.py", line 383, in raw_d
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

The problem is because /etc/utah/config is empty and the json library fails to parse the empty string.