Deleting one WMS setting and selecting another one produces an exception

[Stereo]

What steps will reproduce the problem?

1. Open the WMS settings
2. Select one WMS, and delete it
3. Select another WMS

What is the expected result?

The WMS is selected

What happens instead?

Exception

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

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2012-10-07 01:31:07
Last Changed Author: stoecker
Revision: 5531
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2012-10-06 16:58:02 +0200 (Sat, 06 Oct 2012)
Last Changed Rev: 5531

Identification: JOSM/1.5 (5531 en_GB)
Memory Usage: 1698 MB / 4069 MB (314 MB allocated, but free)
Java version: 1.6.0_37, Apple Inc., Java HotSpot(TM) 64-Bit Server VM
Operating system: Mac OS X
Dataset consistency test: No problems found

Plugin: AddrInterpolation (28807)
Plugin: CommandLine (28807)
Plugin: DirectDownload (28807)
Plugin: DirectUpload (28807)
Plugin: FixAddresses (28807)
Plugin: ImportImagePlugin (28807)
Plugin: OpeningHoursEditor (28656)
Plugin: PicLayer (28807)
Plugin: RoadSigns (28656)
Plugin: buildings_tools (28807)
Plugin: cadastre-fr (28807)
Plugin: contourmerge (1003)
Plugin: dataimport (28656)
Plugin: download_along (28807)
Plugin: importvec (28807)
Plugin: livegps (28807)
Plugin: mapdust (28807)
Plugin: merge-overlap (28807)
Plugin: namemanager (28807)
Plugin: openstreetbugs (28807)
Plugin: pdfimport (28807)
Plugin: public_transport (28807)
Plugin: restart (28492)
Plugin: surveyor (28807)
Plugin: tageditor (28807)
Plugin: terracer (28807)
Plugin: turnlanes (28807)
Plugin: turnrestrictions (28807)
Plugin: utilsplugin2 (28807)
Plugin: wayselector (28807)

java.lang.NullPointerException
	at org.openstreetmap.josm.gui.preferences.imagery.ImageryPreference$ImageryProvidersPanel$ImageryTableCellRenderer.getTableCellRendererComponent(ImageryPreference.java:221)
	at javax.swing.JTable$AccessibleJTable.getAccessibleChild(JTable.java:7023)
	at javax.swing.JTable$AccessibleJTable.getAccessibleAt(JTable.java:7410)
	at javax.swing.JTable$AccessibleJTable.valueChanged(JTable.java:6925)
	at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167)
	at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:147)
	at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:194)
	at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:388)
	at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:398)
	at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:442)
	at javax.swing.JTable.changeSelectionModel(JTable.java:2352)
	at javax.swing.JTable.changeSelection(JTable.java:2421)
	at javax.swing.plaf.basic.BasicTableUI$Handler.adjustSelection(BasicTableUI.java:1085)
	at javax.swing.plaf.basic.BasicTableUI$Handler.mousePressed(BasicTableUI.java:1008)
	at javax.swing.plaf.basic.BasicTableUI$MouseInputHandler.mousePressed(BasicTableUI.java:768)
	at com.apple.laf.AquaTableUI$MouseInputHandler.mousePressed(AquaTableUI.java:82)
	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:263)
	at java.awt.Component.processMouseEvent(Component.java:6379)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3275)
	at java.awt.Component.processEvent(Component.java:6147)
	at java.awt.Container.processEvent(Container.java:2083)
	at java.awt.Component.dispatchEventImpl(Component.java:4744)
	at java.awt.Container.dispatchEventImpl(Container.java:2141)
	at java.awt.Component.dispatchEvent(Component.java:4572)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4619)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4277)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4210)
	at java.awt.Container.dispatchEventImpl(Container.java:2127)
	at java.awt.Window.dispatchEventImpl(Window.java:2489)
	at java.awt.Component.dispatchEvent(Component.java:4572)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:704)
	at java.awt.EventQueue.access$400(EventQueue.java:82)
	at java.awt.EventQueue$2.run(EventQueue.java:663)
	at java.awt.EventQueue$2.run(EventQueue.java:661)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
	at java.awt.EventQueue$3.run(EventQueue.java:677)
	at java.awt.EventQueue$3.run(EventQueue.java:675)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:674)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:205)
	at java.awt.Dialog$1.run(Dialog.java:1044)
	at java.awt.Dialog$3.run(Dialog.java:1096)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.awt.Dialog.show(Dialog.java:1094)
	at java.awt.Component.show(Component.java:1591)
	at java.awt.Component.setVisible(Component.java:1543)
	at java.awt.Window.setVisible(Window.java:843)
	at java.awt.Dialog.setVisible(Dialog.java:984)
	at org.openstreetmap.josm.gui.preferences.PreferenceDialog.setVisible(PreferenceDialog.java:117)
	at org.openstreetmap.josm.actions.PreferencesAction.run(PreferencesAction.java:38)
	at org.openstreetmap.josm.actions.PreferencesAction.actionPerformed(PreferencesAction.java:34)
	at org.openstreetmap.josm.tools.PlatformHookOsx.invoke(PlatformHookOsx.java:56)
	at $Proxy0.handlePreferences(Unknown Source)
	at com.apple.eawt._AppEventLegacyHandler$2.dispatchEvent(_AppEventLegacyHandler.java:90)
	at com.apple.eawt._AppEventLegacyHandler.sendEventToEachListenerUntilHandled(_AppEventLegacyHandler.java:168)
	at com.apple.eawt._AppEventLegacyHandler.handlePreferences(_AppEventLegacyHandler.java:88)
...<snip>.

[Don-vip]

In 5541/josm:

fix #8159 - NPE in imagery providers panel