AddrInterpolation causes NPE

[Sellerhäuser]

If you leave start- and/or end-number empty and try to switch between the numbering schemes the following NPE occurs, this error is reproducible and occurs on both Linux and Windows

Repository Root: ​http://josm.openstreetmap.de/svn
Build-Date: 2010-07-17 01:31:31
Last Changed Author: bastiK
Revision: 3376
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: ​http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2010-07-16 23:44:00 +0200 (Fri, 16 Jul 2010)
Last Changed Rev: 3376

Identification: JOSM/1.5 (3376 de)
Memory Usage: 97 MB / 494 MB (16 MB allocated, but free)
Java version: 1.6.0_21, Sun Microsystems Inc., Java HotSpot(TM) 64-Bit Server VM
Operating system: Linux
Dataset consistency test: No problems found

Plugin: AddrInterpolation (21710)
Plugin: DirectUpload (22017)
Plugin: OpeningHoursEditor (22850)
Plugin: PicLayer (21706)
Plugin: RoadSigns (22850)
Plugin: buildings_tools (22164)
Plugin: editgpx (21706)
Plugin: measurement (21706)
Plugin: openstreetbugs (22466)
Plugin: remotecontrol (22734)
Plugin: reverter (21807)
Plugin: terracer (22169)
Plugin: turnrestrictions (21706)
Plugin: undelete (22365)
Plugin: validator (22445)
Plugin: walkingpapers (21706)
Plugin: wmsplugin (22286)

java.lang.NullPointerException

at org.openstreetmap.josm.plugins.AddrInterpolation.AddrInterpolationDialog.AutoDetectInterpolationMethod(AddrInterpolationDialog.java:349)
at org.openstreetmap.josm.plugins.AddrInterpolation.AddrInterpolationDialog.access$600(AddrInterpolationDialog.java:69)
at org.openstreetmap.josm.plugins.AddrInterpolation.AddrInterpolationDialog$3.focusGained(AddrInterpolationDialog.java:285)
at java.awt.AWTEventMulticaster.focusGained(AWTEventMulticaster.java:203)
at java.awt.Component.processFocusEvent(Component.java:6156)
at java.awt.Component.processEvent(Component.java:6023)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4630)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1850)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:901)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:513)
at java.awt.Component.dispatchEventImpl(Component.java:4502)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4460)
at sun.awt.X11.XWindow$1.run(XWindow.java:380)
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.pumpEventsForFilter(EventDispatchThread.java:178)
at java.awt.Dialog$1.run(Dialog.java:1046)
at java.awt.Dialog$3.run(Dialog.java:1098)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Dialog.java:1096)
at javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:853)
at org.openstreetmap.josm.tools.BugReportExceptionHandler.handleException(BugReportExceptionHandler.java:67)
at org.openstreetmap.josm.tools.BugReportExceptionHandler.handle(BugReportExceptionHandler.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.awt.EventDispatchThread.handleException(EventDispatchThread.java:388)
at java.awt.EventDispatchThread.processException(EventDispatchThread.java:294)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:286)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)
at java.awt.Dialog$1.run(Dialog.java:1046)
at java.awt.Dialog$3.run(Dialog.java:1098)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Dialog.java:1096)
at java.awt.Component.show(Component.java:1563)
at java.awt.Component.setVisible(Component.java:1515)
at java.awt.Window.setVisible(Window.java:842)
at java.awt.Dialog.setVisible(Dialog.java:986)
at org.openstreetmap.josm.plugins.AddrInterpolation.AddrInterpolationDialog.ShowDialog(AddrInterpolationDialog.java:158)
at org.openstreetmap.josm.plugins.AddrInterpolation.AddrInterpolationDialog.<init>(AddrInterpolationDialog.java:130)
at org.openstreetmap.josm.plugins.AddrInterpolation.AddrInterpolationAction.actionPerformed(AddrInterpolationAction.java:34)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1223)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1264)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
at java.awt.Component.processMouseEvent(Component.java:6267)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6032)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4630)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2478)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
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)