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 ( paramHandle != selectedParameter )
							{
								paramName = paramHandle.getName( );
							}
							else
							{
								paramName = paramNameEditor.getText( ).trim( );
							}
							value = getDummyText( paramHandle ) + paramName;
						}
						break;
					}
					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;