Clicked on Help when plugin cant be loaded info at startup

[pschonmann]

What steps will reproduce the problem?

1. Use plugin below, i think contain no info about version
2. Start josm and will inform you about not loading that plugin
3. Click on Help button to get more info about it > CRASH

What is the expected result?

Something different than exception

What happens instead?

Please provide any additional information below. Attach a screenshot if
possible.

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2014-01-29 15:23:51
Last Changed Author: Don-vip
Revision: 6767
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2014-01-29 16:18:16 +0100 (Wed, 29 Jan 2014)
Last Changed Rev: 6767

Identification: JOSM/1.5 (6767 cs) Windows 7 64-Bit
Memory Usage: 245 MB / 3637 MB (187 MB allocated, but free)
Java version: 1.7.0_51, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
VM arguments: [-Dsun.java2d.d3d=false]

Plugin: Create_grid_of_ways
Plugin: DirectDownload
Plugin: DirectUpload
Plugin: ElevationProfile
Plugin: ImageryCache
Plugin: InfoMode
Plugin: OpeningHoursEditor
Plugin: PicLayer
Plugin: RoadSigns
Plugin: Tracer
Plugin: buildings_tools
Plugin: continuosDownload
Plugin: czechaddress
Plugin: dataimport
Plugin: geochat
Plugin: gpxfilter
Plugin: imagery_offset_db
Plugin: jts
Plugin: merge-overlap
Plugin: mirrored_download
Plugin: namemanager
Plugin: notes
Plugin: public_transport
Plugin: reltoolbox
Plugin: reverter
Plugin: routes
Plugin: tag2link
Plugin: tagging-preset-tester
Plugin: tracer
Plugin: turnlanes
Plugin: utilsplugin2
Plugin: wikipedia

java.lang.NullPointerException
	at org.openstreetmap.josm.gui.help.HelpBrowser.setVisible(HelpBrowser.java:221)
	at org.openstreetmap.josm.gui.help.HelpBrowser.openHelpTopic(HelpBrowser.java:417)
	at org.openstreetmap.josm.gui.help.HelpBrowser$1.run(HelpBrowser.java:88)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$200(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.WaitDispatchSupport$2.run(Unknown Source)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$200(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

[Don-vip]

In 6800/josm:

fix #9657 - NPE