fix an autobug

0java.util.NoSuchElementException: key not found: RC4_REV
1at scala.collection.MapLike$class.default(MapLike.scala:228)
2at scala.collection.AbstractMap.default(Map.scala:58)
3at scala.collection.MapLike$class.apply(MapLike.scala:141)
4at scala.collection.AbstractMap.apply(Map.scala:58)
5at com.geeksville.andropilot.gui.JoystickController$$anonfun$getParameters$1.makeInfo$1(JoystickController.scala:135)
6at com.geeksville.andropilot.gui.JoystickController$$anonfun$getParameters$1.apply(JoystickController.scala:148)
7at com.geeksville.andropilot.gui.JoystickController$class.getParameters(JoystickController.scala:130)
8at com.geeksville.andropilot.gui.JoystickController$class.handleParameters(JoystickController.scala:123)
9at com.geeksville.andropilot.gui.MainActivity.handleParameters(MainActivity.scala:547)
10at com.geeksville.andropilot.gui.MainActivity$$anonfun$onVehicleReceive$1$$anonfun$applyOrElse$6.apply(MainActivity.scala:225)
11at com.geeksville.andropilot.gui.MainActivity$$anonfun$onVehicleReceive$1$$anonfun$applyOrElse$6.apply(MainActivity.scala:225)
fix an autobug

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
1at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
2at dalvik.system.NativeStart.main(Native Method)
3Caused by: java.lang.reflect.InvocationTargetException
4at java.lang.reflect.Method.invokeNative(Native Method)
5at java.lang.reflect.Method.invoke(Method.java:511)
6at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
7... 2 more
8Caused by: java.lang.Exception: Not yet implemented
9at com.geeksville.andropilot.gui.WaypointMenuItem$class.doGoto(WaypointMenuItem.scala:36)
10at com.geeksville.andropilot.gui.MyMapFragment$MyMarker.doGoto(MyMapFragment.scala:79)
11at com.geeksville.andropilot.gui.WaypointActionMode.onActionItemClicked(WaypointActionMode.scala:238)
new release