Getting rid of a silly `else` block

sylvilagus/scala/src/main/scala/com/meatballhat/sylvilagus/ch02/HelloWorldProducer.scala

@@ -5,7 +5,8 @@ import com.rabbitmq.client._
 object HelloWorldProducer extends App {
     if (args.length < 1) {
         println("You must provide a message argument")
-    } else {
+        exit
+    }
     var messageBody = args(0)
 
     var factory = new ConnectionFactory()
@@ -21,4 +22,3 @@ object HelloWorldProducer extends App {
 
     connection.close()
 }
-}