Bug 153523 OK button in parameter dialog is enabled without default value in combo-box
Description: OK button in parameter dialog is enabled without default value in combo-box Steps to reproduce: 1. New a report parameter, combo-box. 2. Click New button, input abc as value, click OK 3. Set abc as default value and close Edit Parameter dialog. 4. New a data source and dataset 5. Edit the parameter, remove abc value and import values from dataset Expected result: OK button is disabled for there is no default value. Actual result: OK button is enabled.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
}
			else if ( COLUMN_VALUE.equals( property ) )
			{
				try
				{
					( (ScalarParameterHandle) actualElement ).setValueExpr( DEUtil.getColumnExpression( (String) value ) );
				}
				catch ( SemanticException e )
				{
					ExceptionHandler.handle( e );
				}
			}
			else if ( COLUMN_DISPLAY_TEXT.equals( property ) )
			{
				try
				{
					( (ScalarParameterHandle) actualElement ).setLabelExpr( DEUtil.getColumnExpression( (String) value ) );
				}
				catch ( SemanticException e )
				{
					ExceptionHandler.handle( e );
				}
			}
			if ( actualElement == newParameter )
			{
				if ( isSingle( ) || newParameter.getDataSetName( ) != null )
				{
					try
					{
						inputParameterGroup.getParameters( ).add( newParameter );