Review request for JDK-8054898: Avoid creation of empty type info files

[Hannes Wallnoefer]

Please review JDK-8054898: Avoid creation of empty type info files:

http://cr.openjdk.java.net/~hannesw/8054898/

This is a one-liner to avoid creating a type info file when we don't 
have to.

Thanks,
Hannes