Don't reconstruct color sensor if not connected

[ky28059]

If we lose communication with the sensor over I²C, we don't need to reinitialize the connection to start receiving data again; initializing the device only writes config settings to the color sensor. AFAIK I²C is not bidirectional and so we don't need to "handshake" before the sensor starts sending data to the RIO; rather, the RIO sends read requests to the sensor (when we call .getColor() in this case).

I think all reconstructing the sensor does is send unnecessary I²C write requests and spam console with errors.

[e3l]

do these write to registers on the color sensor itself? if so, it might be necessary to reconnect to the color sensor -- this data might be lost when power is dropped.