load_data raises an exception when parsing invalid JSON

In python3.4 the @load command raises an AttributeError exception when trying to parse invalid JSON:

Traceback (most recent call last):
  File "/home/bobh/git/yaql/yaql/cli/cli_functions.py", line 101, in load_data
    data = json.loads(json_str)
  File "/usr/local/lib/python3.4/json/__init__.py", line 318, in loads
    return _default_decoder.decode(s)
  File "/usr/local/lib/python3.4/json/decoder.py", line 343, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/local/lib/python3.4/json/decoder.py", line 361, in raw_decode
    raise ValueError(errmsg("Expecting value", s, err.value)) from None
ValueError: Expecting value: line 1 column 1 (char 0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/bobh/git/yaql/yaql/tests/test_miscellaneous.py", line 106, in test_load_data
    self.assertIsNone(load_data(f.name, context))
  File "/home/bobh/git/yaql/yaql/cli/cli_functions.py", line 103, in load_data
    print('Unable to parse data: ' + e.message)
AttributeError: 'ValueError' object has no attribute 'message'

The ValueError exception from json.loads() does not have a message attribute