minor check for valid frames before updating servo position for the left/right hand.
minor check for valid frames before updating servo position for the left/right hand.

lanchun/myrobotlab,MyRobotLab/myrobotlab,MyRobotLab/myrobotlab,robojukie/myrobotlab,MyRobotLab/myrobotlab,MyRobotLab/myrobotlab,lanchun/myrobotlab,robojukie/myrobotlab,MyRobotLab/myrobotlab,MyRobotLab/myrobotlab,lanchun/myrobotlab,MyRobotLab/myrobotlab,robojukie/myrobotlab