hg: jdk/sandbox: 8193137: Nashorn crashes when given an empty script file

[chris.hegarty at oracle.com]

Changeset: ef5199ed52f0
Author:    hannesw
Date:      2017-12-08 12:02 +0100
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/ef5199ed52f0

8193137: Nashorn crashes when given an empty script file
Reviewed-by: hannesw, sundar
Contributed-by: priya.lakshmi.muthuswamy at oracle.com

! src/jdk.scripting.nashorn/share/classes/jdk/nashorn/tools/Shell.java
+ test/nashorn/script/nosecurity/JDK-8193137.js