Bug 183308 IllegalArgumentException occurs after insert a empty group on a List report item[0001]
Description: IllegalArgumentException occurs after insert a empty group on a List report item[0001] Build number: 2.2.0.v20070419-0945 Steps to reproduce: 1, Insert a list 2, Insert a group on the list, only specify the Group On: "aa" Expected result: No exception Actual result: IllegalArgumentException occurs Error log: java.lang.IllegalArgumentException: Argument cannot be null at org.eclipse.swt.SWT.error(SWT.java:3483) at org.eclipse.swt.SWT.error(SWT.java:3422) at org.eclipse.swt.SWT.error(SWT.java:3393) at org.eclipse.swt.widgets.Widget.error(Widget.java:432) at org.eclipse.swt.widgets.Text.setText(Text.java:1793) at org.eclipse.birt.report.designer.ui.dialogs.GroupDialog$6.focusLost(GroupDialog.java:485) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:136) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:962)
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
intervalChoices = intervalChoicesAll;
		resetIntervalType( intervalChoices );
		previoiusKeyExpression = currentKeyExpression;
	}
	/**
	 * Get subIntervalChoice, could be String,Date,Numeric or All
	 * 
	 * @return
	 */
	private IChoice[] getSubIntervalChoice( )
	{
		Class columnType = getColumnType( );
		if ( columnType == null )
			return intervalChoicesAll;
		if ( String.class.isAssignableFrom( columnType ) )
		{
			return intervalChoicesString;
		}
		else if ( Date.class.isAssignableFrom( columnType ) )
		{
			return intervalChoicesDate;
		}
		else if ( Number.class.isAssignableFrom( columnType ) )
		{
			return intervalChoicesNumeric;
		}
		else
		{
			return intervalChoicesAll;
		}