Bug 141951 Export data throw NPE when target document doesn't exist
Description: Export data doesn't work when deploy birt in WebSphere6 Steps to reproduce: 1. Deploy birt in WebSphere6 2. Preview report and click Export Data Result: java.lang.NullPointerException Stack Trace: org.apache.axis.AxisFault.makeFault(AxisFault.java:101) org.eclipse.birt.report.soapengine.processor.AbstractBaseComponentProcessor.process(Unknown Source) org.eclipse.birt.report.soapengine.endpoint.BirtSoapBindingImpl.getUpdatedObjects(Unknown Source) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/BirtViewerReportService.java
if ( reportDesignName.endsWith( "\\" )
							|| reportDesignName.endsWith( "/" ) )
						reportDesignName = null;
				}
			}
		}
		return reportDesignName;
	}
	/*
	 * Convert engine parameters (IScalarParameterDefn and IParameterGroupDefn)
	 * into service api parameters (ParameterDefinition and
	 * ParameterGroupDefinition)
	 * 
	 * @param params a Collection of IScalarParameterDefn or IParameterGroupDefn
	 * @param task the task to use to get selection list for a parameter @param
	 * includeGroups if true, include groups (ParameterGroupDefinition) in the
	 * result, otherwise flatten the result (i.e. include the contents of the
	 * groups in the result)
	 * 
	 * @return a Collection of ParameterDefinition and ParameterGroupDefinition,
	 * or a Collection of only ParameterDefinition if includeGroups == false
	 */
	private static Collection convertEngineParameters( Collection params,
			IGetParameterDefinitionTask task, boolean includeGroups )
	{
		if ( params == null )
			return Collections.EMPTY_LIST;
		List ret = new ArrayList( );
		for ( Iterator it = params.iterator( ); it.hasNext( ); )
		{