description:
exception is thrown out when select ascending in "group and sorting" dialogue when running "chartwizardlauncher.java".

build number:
2.6.0.v20100512-0630

steps to reproduce:
1. run
/org.eclipse.birt.chart.examples/src/org/eclipse/birt/chart/examples/builder/chartwizardlauncher.java
2. in select data tab, click "edit group and sorting" button, select "ascending".

expected result:
no exception.

actual result:
exception is thrown out.
error log:
java.lang.nullpointerexception
	at org.eclipse.birt.chart.ui.swt.composites.groupsortingdialog.getpredefinedquery(groupsortingdialog.java:459)
	at org.eclipse.birt.chart.ui.swt.composites.groupsortingdialog.populatesortkeylist(groupsortingdialog.java:497)
	at org.eclipse.birt.chart.ui.swt.composites.groupsortingdialog.handleevent(groupsortingdialog.java:557)
	at org.eclipse.swt.widgets.eventtable.sendevent(eventtable.java:84)
	at org.eclipse.swt.widgets.widget.sendevent(widget.java:1052)
	at org.eclipse.swt.widgets.display.rundeferredevents(display.java:4066)
	at org.eclipse.swt.widgets.display.readanddispatch(display.java:3657)
	at org.eclipse.jface.window.window.runeventloop(window.java:825)
	at org.eclipse.jface.window.window.open(window.java:801)
	at org.eclipse.birt.chart.ui.swt.wizard.data.basedatadefinitioncomponent.handlegroupaction(basedatadefinitioncomponent.java:509)
	at org.eclipse.birt.chart.ui.swt.wizard.data.basedatadefinitioncomponent.widgetselected(basedatadefinitioncomponent.java:497)
	at org.eclipse.swt.widgets.typedlistener.handleevent(typedlistener.java:234)
	at org.eclipse.swt.widgets.eventtable.sendevent(eventtable.java:84)
	at org.eclipse.swt.widgets.widget.sendevent(widget.java:1052)
	at org.eclipse.swt.widgets.display.rundeferredevents(display.java:4066)
	at org.eclipse.swt.widgets.display.readanddispatch(display.java:3657)
	at org.eclipse.jface.window.window.runeventloop(window.java:825)
	at org.eclipse.jface.window.window.open(window.java:801)
	at org.eclipse.birt.core.ui.frameworks.taskwizard.wizardbase.open(wizardbase.java:87)
	at org.eclipse.birt.chart.ui.swt.wizard.chartwizard.open(chartwizard.java:234)
	at org.eclipse.birt.core.ui.frameworks.taskwizard.wizardbase.open(wizardbase.java:100)
	at org.eclipse.birt.chart.examples.builder.chartwizardlauncher.launch(chartwizardlauncher.java:137)
	at org.eclipse.birt.chart.examples.builder.chartwizardlauncher.main(chartwizardlauncher.java:220)
set a dummy pre-defined expression for chartwizardlauncher.
verified on build 2.6.0 v20100521-0630.
closed.