esdoc search cannot exploit https; more informative error needed

[bnlawrence]

This probably should not raise a JSON error, since the actual error is not a JSON error, but something to do with the transport and/or what is returned ...

The following code works:

os.environ['ESDOC_API'] = 'http://test-api.es-doc.org/'
import pyesdoc as esd
docs = esd.search('cmip6','experiments')
docs

returning

Out[5]: {'count': 289}

The following does not:

os.environ['ESDOC_API'] = 'https://test-api.es-doc.org/'
import pyesdoc as esd
docs = esd.search('cmip6','experiments')

returning

    docs = esd.search('cmip6','experiments')
  File "/Users/BNL28/anaconda3/envs/py27/lib/python2.7/site-packages/pyesdoc/_search.py", line 83, in search
    return SearchResult(json.loads(response.text))
  File "/Users/BNL28/anaconda3/envs/py27/lib/python2.7/json/__init__.py", line 339, in loads
    return _default_decoder.decode(s)
  File "/Users/BNL28/anaconda3/envs/py27/lib/python2.7/json/decoder.py", line 364, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/Users/BNL28/anaconda3/envs/py27/lib/python2.7/json/decoder.py", line 382, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded``