hg: openjfx/9-dev/rt: 8162693: javapackager returns null if com.oracle.tools.packager.windows.WinAppBundler called twice

[chris.bensen at oracle.com]

Changeset: 12e6cb1e78af
Author:    vdrozdov
Date:      2016-11-18 09:14 -0800
URL:       http://hg.openjdk.java.net/openjfx/9-dev/rt/rev/12e6cb1e78af

8162693: javapackager returns null if com.oracle.tools.packager.windows.WinAppBundler called twice
Reviewed-by: cbensen

! modules/jdk.packager/src/main/java/jdk/packager/builders/windows/WindowsAppImageBuilder.java