Update Image.scala

[ggmoriyon]

fixed assert

[ggmoriyon]

Here is the error trace when uploading files before fixing the parenthesis on the assert:

 play.api.Application$$anon$1: Execution exception[[ExecutionException: Boxed Error]]
at play.api.Application$class.handleError(Application.scala:289) ~[play_2.10-2.1.1.jar:2.1.1]
at play.api.DefaultApplication.handleError(Application.scala:383) [play_2.10-2.1.1.jar:2.1.1]
at play.core.server.netty.PlayDefaultUpstreamHandler$$anon$2$$anonfun$handle$1.apply(PlayDefaultUpstreamHandler.scala:144) [play_2.10-2.1.1.jar:2.1.1]
at play.core.server.netty.PlayDefaultUpstreamHandler$$anon$2$$anonfun$handle$1.apply(PlayDefaultUpstreamHandler.scala:140) [play_2.10-2.1.1.jar:2.1.1]
at play.api.libs.concurrent.PlayPromise$$anonfun$extend1$1.apply(Promise.scala:113) [play_2.10-2.1.1.jar:2.1.1]
at play.api.libs.concurrent.PlayPromise$$anonfun$extend1$1.apply(Promise.scala:113) [play_2.10-2.1.1.jar:2.1.1]
 java.util.concurrent.ExecutionException: Boxed Error
at scala.concurrent.impl.Promise$.resolver(Promise.scala:52) ~[scala-library.jar:na]
at scala.concurrent.impl.Promise$.scala$concurrent$impl$Promise$$resolveTry(Promise.scala:44) ~[scala-library.jar:na]
at scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:116) ~[scala-library.jar:na]
at scala.concurrent.Promise$class.complete(Promise.scala:55) ~[scala-library.jar:na]
at scala.concurrent.impl.Promise$DefaultPromise.complete(Promise.scala:58) ~[scala-library.jar:na]
at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:23) [scala-library.jar:na]
 Caused by: java.lang.AssertionError: assertion failed
at scala.Predef$.assert(Predef.scala:165) ~[scala-library.jar:na]
at models.Image$.fromFilePart(Image.scala:47) ~[classes/:na]
at controllers.Application$$anonfun$upload$1$$anonfun$1$$anonfun$apply$12.apply(Application.scala:64) ~[classes/:na]
at controllers.Application$$anonfun$upload$1$$anonfun$1$$anonfun$apply$12.apply(Application.scala:62) ~[classes/:na]
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244) ~[scala-library.jar:na]
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244) ~[scala-library.jar:na]