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
{
						if ( !COLUMN_DATA_SET.equals( property ) )
						{
							return false;
						}
					}
					else
					{
						if ( !COLUMN_VALUE.equals( property ) )
						{
							return false;
						}
					}
				}
				else if ( !COLUMN_DATA_SET.equals( property ) )
				{
					return false;
				}
			}
			if ( COLUMN_VALUE.equals( property ) )
			{
				if ( getDataSetColumns( (ScalarParameterHandle) element, true ).length == 0 )
				{
					return false;
				}
			}
			setCellEditorItems( );
			return true;
		}
		public Object getValue( Object element, String property )