sranieri53

picker crash NullPointerException.

1

the picker on some devices throw a Nullpointer exception. ``` Fatal Exception: java.lang.NullPointerException Attempt to invoke virtual method 'void android.view.VelocityTracker.addMovement(android.view.MotionEvent)' on a null object reference com.aigestudio.wheelpicker.WheelPicker.onTouchEvent (WheelPicker.java:718) ```