Made the empty string print as "" in the repl instead of as nothing.

This after being misled one too many times by a variation of this:

scala> List[String]()
res1: List[String] = List()

scala> List[String]("")
res2: List[String] = List()

No review.

git-svn-id: http://lampsvn.epfl.ch/svn-repos/scala/scala/trunk@24041 5e8d7ff9-d8ef-0310-90f0-a4852d11357a

src/library/scala/runtime/ScalaRunTime.scala

@@ -289,6 +289,7 @@ object ScalaRunTime {
     // The recursively applied attempt to prettify Array printing
     def inner(arg: Any): String = arg match {
       case null                         => "null"
+      case ""                           => "\"\""
       case x if useOwnToString(x)       => x.toString
       case x: AnyRef if isArray(x)      => WrappedArray make x take maxElements map inner mkString ("Array(", ", ", ")")
       case x: collection.Map[_, _]      => x take maxElements map mapInner mkString (x.stringPrefix + "(", ", ", ")")