Mapping agent returns JSONDecodeError: Expecting value: line 1 column 1 (char 0)

[caufieldjh]

The Match function (c/o the Mapping agent) raises a JSONDecodeError on all inputs.
In the app, using input text like "fever" and relevant fields of label, definition with an ont_hp collection raises this:

2024-08-13 17:50:21.052 Uncaught app exception
Traceback (most recent call last):
  File "/home/harry/curate-gpt/.venv/lib/python3.10/site-packages/streamlit/runtime/scriptrunner/exec_code.py", line 85, in exec_func_with_error_handling
    result = func()
  File "/home/harry/curate-gpt/.venv/lib/python3.10/site-packages/streamlit/runtime/scriptrunner/script_runner.py", line 576, in code_to_exec
    exec(code, module.__dict__)
  File "/home/harry/curate-gpt/src/curate_gpt/app/app.py", line 317, in <module>
    results = mapper.match(
  File "/home/harry/curate-gpt/src/curate_gpt/agents/mapping_agent.py", line 141, in match
    for m in json.loads(response_text):
  File "/usr/lib/python3.10/json/__init__.py", line 346, in loads
    return _default_decoder.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)