RFR (XS): 6800801: NPE in JConsole when using Nimbus L&F

[Erik Gahlin]

Please review a small change.

Description:
Start JConsole from the commandline using the Nimbus look & feel:

jconsole 
-J-Dswing.defaultlaf=com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel

The main window opens, but when creating the 'Connect to..' dialog, we 
get a NPE:

Bug:
http://monaco.us.oracle.com/detail.jsf?cr=6800801

Webrev:
http://cr.openjdk.java.net/~egahlin/6800801/

Testing:
Clicked around in GUI with Nimbus L&F

A sponsor is needed.

Thanks
Erik