RFR 8068741: javax.script.ScriptEngineFactory.getMethodCallSyntax() spec allows null passed as an object

[Sundararajan Athijegannathan]

Please review.

Bug: https://bugs.openjdk.java.net/browse/JDK-8068741
Webrev:  http://cr.openjdk.java.net/~sundar/8068741/webrev.00/index.html

Thanks,
-Sundar