Bug 180864 Change Allow Null option in Cascading Group.[0705]
Description: Change Allow Null option in Cascading Group. Build number:2.2.0.v20070404 Steps to reproduce: 1. New a cascading group and add sub parameter. Expected result: Is Required option in cascading group definition dialog. Actual result: Allow null value option in Cascading Group definition dialog Error log:N/A
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
}
					case 1 :
					{
						DataSetHandle dataSet = null;
						if ( isSingle( ) )
						{
							if ( paramHandle != getFirstParameter( ) )
							{
								break;
							}
							dataSet = inputParameterGroup.getDataSet( );
						}
						else
						{
							dataSet = getDataSet( paramHandle );
						}
						if ( dataSet == null )
						{
							value = LABEL_SELECT_DATA_SET;
						}
						else
						{
							value = dataSet.getName( );
						}
						break;
					}
					case 2 :
					{
						if ( paramHandle.getValueExpr( ) != null )
						{