2017-10-12 09:32:28,073 ERROR    root         cannot make last_few_vec plot
Traceback (most recent call last):
  File "/usr/local/currents/bin/run_lastfew_vec.py", line 106, in <module>
    LFV.get_data()
  File "/usr/local/lib/python2.7/dist-packages/pycurrents/adcp/plot_lastfew_vec.py", line 107, in get_data
    log.info('startdd=%7.5f' % (self.startdd))
TypeError: float argument required, not NoneType