We need to pass-thru the ERROR messages in a better way to the Python package

[vsenderov]

For example, from Python:

$ python3 experiment.py data/jeremy-crbd__12.1.a-1.json data/prior.json
Traceback (most recent call last):
  File "/home/viktor/treeppl-python/treeppl/base.py", line 72, in __init__
    result = from_json(stdout)
  File "/home/viktor/treeppl-python/treeppl/serialization.py", line 41, in from_json
    return json.load(fp, object_hook=object_hook)
  File "/usr/lib/python3.10/json/__init__.py", line 293, in load
    return loads(fp.read(),
  File "/usr/lib/python3.10/json/__init__.py", line 359, in loads
    return cls(**kw).decode(s)
  File "/usr/lib/python3.10/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python3.10/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/mnt/c/Users/senderov/Sync/Workspaces/Q-T-Birds/experiments/sprint15/experiment.py", line 54, in <module>
    res = qtbirds( tree=tree
  File "/home/viktor/treeppl-python/treeppl/base.py", line 66, in __call__
    return InferenceResult(proc.stdout)
  File "/home/viktor/treeppl-python/treeppl/base.py", line 74, in __init__
    raise InferenceError("Could not parse the output from TreePPL.")
treeppl.exceptions.InferenceError: Could not parse the output from TreePPL.

It is not obvious what the error is. But from the command-line:

$ ./out input.json
ERROR <qtbirds.tppl 217:35-217:45>:
Field 'rigth' not found
  let rightTime = getAgeDiff(tree, tree.rigth);
viktor@BDWF26:~/qtbirds.tppl$

you see that we just misspelled right as rigth.