Fix https://github.com/adafruit/Adafruit_CircuitPython_GPS/issues/105 #115
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Changes parsing for RMC messages to that time values are still reported even if there is not a GPS fix. This is particularly relevant for GPS cards which have a battery included and maintain an RTC clock onboard, eg: the adafruit Ultimate GPS v3.
Note there is a logical change in _parse_rmc which means lat/lon values won't be returned when there's no fix. Prior version could conceivably have allowed this, but I believe that lat/lon/speed values are never provided without a fix in practice.