RFR 8195829 Parsing a nameless ES6 class results in a thrown NullPointerException.

[Sundararajan Athijegannathan]

Please review.

Webrev: http://cr.openjdk.java.net/~sundar/8195829/webrev.00/index.html
Bug: https://bugs.openjdk.java.net/browse/JDK-8195829

Thanks,
-Sundar