Bug 193875 we can not get an entir url by IHTMLActionHandler
we can not get an entir url by IHTMLActionHandler, so word emitter dose not write the right url. now hyperlink drill through in word emitter doesn't work.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
missingParameter = true;
				break;
			}
			if ( IScalarParameterDefn.TYPE_STRING == parameterObj.getDataType( ) )
			{
				String parameterStringValue = (String) parameterValue;
				if ( parameterStringValue != null
						&& parameterStringValue.length( ) <= 0
						&& !parameterObj.allowBlank( ) )
				{
					missingParameter = true;
					break;
				}
			}
		}
		return missingParameter;
	}
	/**
	 * uses to clear the data cach.
	 * 
	 * @param dataSet
	 *            the dataset handle
	 * @throws BirtException
	 */
	public void clearCache( DataSetHandle dataSet ) throws BirtException
	{
		DataSessionContext context = new DataSessionContext(
				DataSessionContext.MODE_DIRECT_PRESENTATION, dataSet
						.getModuleHandle( ), null );
		DataRequestSession requestSession = DataRequestSession