guess reason for OpenAddresses failure

guess.py

def guess_reason(log):
    '''
    '''
    if 'JobTimeoutException' in log:
        return 'took too long'
    elif 'DownloadError: 404 response' in log:
        return 'missing source'
    elif 'Source says to skip' in log:
        return 'skipped'
    elif 'Invalid number of points in LinearRing' in log:
        return 'invalid geometry'
    elif 'Problem querying ESRI field names' in log:
        return 'bad Esri metadata'
    elif 'File "/usr/local/lib/python2.7/dist-packages/openaddr/cache.py", line 320' in log:
        return 'bad Esri metadata'
    elif 'File "/usr/local/lib/python2.7/dist-packages/openaddr/cache.py", line 400' in log:
        return 'bad Esri data'
    elif 'File "/usr/local/lib/python2.7/dist-packages/openaddr/cache.py", line 261' in log:
        return 'bad Esri geometry'
    elif 'File "/usr/local/lib/python2.7/dist-packages/openaddr/conform.py", line 588' in log:
        return 'incorrect conform'
    elif 'File "/usr/local/lib/python2.7/dist-packages/openaddr/cache.py", line 137' in log:
        return 'unknown file extension'
    elif 'Max retries exceeded with url:' in log:
        return 'exceeded request limit'
    elif "cannot concatenate 'str' and 'NoneType' objects" in log:
        return 'unknown content-type'
    elif 'Source says to skip' in log:
        return 'skipped'
    else:
        return '?'