ValueError: No JSON object could be decoded

[sentry]

When build.gluster.org API doesn't respond, we throw a traceback rather than catching it gracefully.

Sentry Issue: FSTAT-4

ValueError: No JSON object could be decoded
(5 additional frame(s) were not displayed)
...
  File "parser.py", line 95, in get_summary
    ]), verify=False).json()
  File "models.py", line 896, in json
    return complexjson.loads(self.text, **kwargs)
  File "__init__.py", line 338, in loads
    return _default_decoder.decode(s)
  File "decoder.py", line 366, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "decoder.py", line 384, in raw_decode
    raise ValueError("No JSON object could be decoded")