change behavior of getLastTimestamp to return last valid value if packet is empty
change behavior of getLastTimestamp to return last valid value if packet is empty
SensorsINI/jaer,SensorsINI/jaer,SensorsINI/jaer,SensorsINI/jaer,SensorsINI/jaer,SensorsINI/jaer,SensorsINI/jaer,SensorsINI/jaer