Handling invalid json responses in wys_api.py #501

[tahaislam]

What this pull request accomplishes:

• It handles the exception json.decoder.JSONDecodeError in wys_api.py by logging the returned error message and passing the exception back to the calling function in order to skip the failing hour

Issue(s) this solves:

• #501

What, in particular, needs to reviewed:

• function get_statistics_hourly in wys/api/python/wys_api.py