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
{
						( (ScalarParameterHandle) actualElement ).setName( newParameter.getName( ) );
					}
					else
					{
						( (ScalarParameterHandle) actualElement ).setName( (String) value );
					}
				}
				catch ( NameException e )
				{
					ExceptionHandler.handle( e );
				}
			}
			if ( COLUMN_DATA_SET.equals( property ) )
			{
				try
				{
					if ( isSingle( ) )
					{
						inputParameterGroup.setDataSet( getDataSet( (String) value ) );
					}
					else
					{
						( (ScalarParameterHandle) actualElement ).setDataSetName( (String) value );
					}
				}
				catch ( SemanticException e )
				{
					ExceptionHandler.handle( e );
				}