If the emitter is closed while processing data, then just eat the remaining data.

Don't throw an exception, as this is a valid case.  This can happen if a request is cancelled while it's still processing the data.

Code is from 11/11/2014.  The pair of callstacks that lead me to this:

E/VIMEO   ( 5941): Error getting video: 
E/VIMEO   ( 5941): java.util.concurrent.CancellationException
E/VIMEO   ( 5941): 	at com.koushikdutta.async.future.SimpleFuture.cancelInternal(SimpleFuture.java:39)
E/VIMEO   ( 5941): 	at com.koushikdutta.async.future.SimpleFuture.cancel(SimpleFuture.java:54)
E/VIMEO   ( 5941): 	at com.koushikdutta.ion.Ion.cancelAll(Ion.java:351)
E/VIMEO   ( 5941): 	at com.koushikdutta.ion.Ion.cancelAll(Ion.java:382)
E/VIMEO   ( 5941): 	at tv.ouya.console.launcher.store.DetailsActivity.onPause(DetailsActivity.java:568)
E/VIMEO   ( 5941): 	at android.app.Activity.performPause(Activity.java:5161)
E/VIMEO   ( 5941): 	at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1225)
E/VIMEO   ( 5941): 	at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2825)
E/VIMEO   ( 5941): 	at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2794)
E/VIMEO   ( 5941): 	at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:2772)
E/VIMEO   ( 5941): 	at android.app.ActivityThread.access$800(ActivityThread.java:130)
E/VIMEO   ( 5941): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1212)
E/VIMEO   ( 5941): 	at android.os.Handler.dispatchMessage(Handler.java:99)
E/VIMEO   ( 5941): 	at android.os.Looper.loop(Looper.java:137)
E/VIMEO   ( 5941): 	at android.app.ActivityThread.main(ActivityThread.java:4745)
E/VIMEO   ( 5941): 	at java.lang.reflect.Method.invokeNative(Native Method)
E/VIMEO   ( 5941): 	at java.lang.reflect.Method.invoke(Method.java:511)
E/VIMEO   ( 5941): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
E/VIMEO   ( 5941): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
E/VIMEO   ( 5941): 	at dalvik.system.NativeStart.main(Native Method)

-- and --

E/AndroidRuntime( 5941): FATAL EXCEPTION: ion-ion
E/AndroidRuntime( 5941): java.lang.RuntimeException: Not all data was consumed by Util.emitAllData
E/AndroidRuntime( 5941): 	at com.koushikdutta.async.Util.emitAllData(Util.java:45)
E/AndroidRuntime( 5941): 	at com.koushikdutta.async.http.ResponseCacheMiddleware$CachedBodyEmitter.spewInternal(ResponseCacheMiddleware.java:413)
E/AndroidRuntime( 5941): 	at com.koushikdutta.async.http.ResponseCacheMiddleware$1.run(ResponseCacheMiddleware.java:167)
E/AndroidRuntime( 5941): 	at com.koushikdutta.async.AsyncServer.lockAndRunQueue(AsyncServer.java:708)
E/AndroidRuntime( 5941): 	at com.koushikdutta.async.AsyncServer.runLoop(AsyncServer.java:725)
E/AndroidRuntime( 5941): 	at com.koushikdutta.async.AsyncServer.run(AsyncServer.java:626)
E/AndroidRuntime( 5941): 	at com.koushikdutta.async.AsyncServer.access$700(AsyncServer.java:41)
E/AndroidRuntime( 5941): 	at com.koushikdutta.async.AsyncServer$13.run(AsyncServer.java:568)