NPE with yahoo and soft sharpen

[skyper]

What steps will reproduce the problem?

1. open yahoo imagery layer

What is the expected result?

the layer opens.

What happens instead?

exception

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

I have set soft-sharpening

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2011-04-04 01:31:49
Last Changed Author: bastiK
Revision: 4013
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2011-04-03 19:05:53 +0200 (Sun, 03 Apr 2011)
Last Changed Rev: 4013

Identification: JOSM/1.5 (4013 en)
Memory Usage: 249 MB / 1820 MB (64 MB allocated, but free)
Java version: 1.6.0_20, Sun Microsystems Inc., OpenJDK 64-Bit Server VM
Operating system: Linux
Dataset consistency test: No problems found

Plugin: ColumbusCSV (25192)
Plugin: cadastre-fr (25192)
Plugin: colorscheme (25192)
Plugin: openstreetbugs (25540)
Plugin: public_transport (25192)
Plugin: tageditor (25191)
Plugin: toms (23605)
Plugin: undelete (25199)
Plugin: wms-turbo-challenge2 (25191)

java.lang.NullPointerException
	at org.openstreetmap.josm.gui.layer.ImageryLayer.sharpenImage(ImageryLayer.java:222)
	at org.openstreetmap.josm.data.imagery.GeorefImage.changeImage(GeorefImage.java:97)
	at org.openstreetmap.josm.gui.layer.WMSLayer.gatherFinishedRequests(WMSLayer.java:515)
	at org.openstreetmap.josm.gui.layer.WMSLayer.downloadAndPaintVisible(WMSLayer.java:358)
	at org.openstreetmap.josm.gui.layer.WMSLayer.paint(WMSLayer.java:222)
	at org.openstreetmap.josm.gui.MapView.paintLayer(MapView.java:450)
	at org.openstreetmap.josm.gui.MapView.paint(MapView.java:529)
	at javax.swing.JComponent.paintChildren(JComponent.java:866)
	at javax.swing.JSplitPane.paintChildren(JSplitPane.java:1042)
	at javax.swing.JComponent.paint(JComponent.java:1038)
	at javax.swing.JComponent.paintToOffscreen(JComponent.java:5138)
	at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:302)
	at javax.swing.RepaintManager.paint(RepaintManager.java:1145)
	at javax.swing.JComponent._paintImmediately(JComponent.java:5086)
	at javax.swing.JComponent.paintImmediately(JComponent.java:4896)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:740)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:696)
	at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:676)
	at javax.swing.RepaintManager.access$700(RepaintManager.java:57)
	at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1550)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:226)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:647)
	at java.awt.EventQueue.access$000(EventQueue.java:96)
	at java.awt.EventQueue$1.run(EventQueue.java:608)
	at java.awt.EventQueue$1.run(EventQueue.java:606)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:617)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)

[Upliner]

In [4014/josm]:

fix #6177 NPE when using sharpen with Yahoo imagery