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
return element.getColumnName( );
				}
			}
		}
		return null;
	}
	private void updateButtons( )
	{
		boolean okEnable = true;
		Iterator iter = inputParameterGroup.getParameters( ).iterator( );
		if ( !iter.hasNext( ) )
		{
			okEnable = false;
		}
		else
		{
			int count = 0;
			while ( iter.hasNext( ) )
			{
				Object obj = iter.next( );
				if ( obj instanceof ScalarParameterHandle )
				{
					ScalarParameterHandle param = (ScalarParameterHandle) obj;
					count++;
					if ( !checkParameter( param ) )
					{
						okEnable = false;
						break;
					}
				}