Fixes parameter loading check.
Fixes parameter loading check.

duststorm/dronekit-python,trishhyles/dronekit-python,duststorm/dronekit-python,diydrones/dronekit-python,dronekit/dronekit-python,trishhyles/dronekit-python,diydrones/dronekit-python,dronekit/dronekit-python,hamishwillee/dronekit-python,hamishwillee/dronekit-python