remove bug will raise JSONDecodeError

[Ximinhan]

when I try to remove a bug with errata_tool it will raise an error,it can be reproduced, but the bug was actually remove

>>> e=Erratum(errata_id=96478)
>>> e.errata_bugs
[2094745]
>>> e.removeBugs([2094745])
>>> e.commit()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/ximhan/.local/lib/python3.6/site-packages/errata_tool/erratum.py", line 940, in commit
    self._write()
  File "/home/ximhan/.local/lib/python3.6/site-packages/errata_tool/erratum.py", line 901, in _write
    self._processResponse(r)
  File "/home/ximhan/.local/lib/python3.6/site-packages/errata_tool/connector.py", line 247, in _processResponse
    json = r.json()
  File "/usr/local/lib/python3.6/site-packages/requests/models.py", line 900, in json
    return complexjson.loads(self.text, **kwargs)
  File "/home/ximhan/.local/lib/python3.6/site-packages/simplejson/__init__.py", line 525, in loads
    return _default_decoder.decode(s)
  File "/home/ximhan/.local/lib/python3.6/site-packages/simplejson/decoder.py", line 370, in decode
    obj, end = self.raw_decode(s)
  File "/home/ximhan/.local/lib/python3.6/site-packages/simplejson/decoder.py", line 400, in raw_decode
    return self.scan_once(s, idx=_w(s, idx).end())
simplejson.errors.JSONDecodeError: Expecting value: line 11 column 1 (char 10)
>>>