(refs #28)Display avatar icon on the activity timeline.

src/main/scala/app/AccountController.scala

@@ -55,7 +55,10 @@ trait AccountControllerBase extends ControllerBase {
     getAccountByUserName(userName).flatMap(_.image).map { image =>
       contentType = FileUtil.getMimeType(image)
       new java.io.File(getUserUploadDir(userName), image)
-    } getOrElse NotFound
+    } getOrElse {
+      contentType = "image/png"
+      Thread.currentThread.getContextClassLoader.getResourceAsStream("noimage.png")
+    }
   }
 
   get("/:userName/_edit")(oneselfOnly {