Error if Openstreetbug was undocked while closing JOSM

[plaicy]

1. Start JOSM
2. Create new datalayer
3. Open OpenstreetbugsDialog
4. Undock OpenstreetbugsDialog
5. Close JOSM
6. Start JOSM

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.7.0
Created-By: 11.2-b01 (Sun Microsystems Inc.)
Main-class: JOSM
Main-Version: 1986 SVN
Main-Date: 2009-08-20T16:15:05.263127Z
Memory Usage: 11 MB / 254 MB (3 MB allocated, but free)
Java version: 1.6.0_12

Plugins: openstreetbugs
Plugin openstreetbugs Version: 17035

java.lang.NullPointerException

at org.openstreetmap.josm.gui.dialogs.ToggleDialog$3.actionPerformed(ToggleDialog.java:169)
at org.openstreetmap.josm.gui.dialogs.ToggleDialog$5.run(ToggleDialog.java:235)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

[plaicy]

see also #3307 and #3315. I have created separate tickets because it has to be changed in each plugin. Otherwise undock status will not be restored correctly.

[plaicy]

see also #2990 (there it is NOT osmbugplugin).

[Gubaer]

should be fixed in r1999