Bug 162841 [regression]Drill-through link to document containing parameters failed in html and pdf
Description: Drill-through link to document containing parameters failed in html and pdf Steps to reproduce: 1. New a report with a report parameter, don't set default value for it. 2. Preview in Web Viewer, input parameter value and save the report document to c:\ 3. New another report, insert a label, set a drill through link on the label, link to the report document. 4. Preview in web viewer, html and pdf, click the link. Expected result: Link to target report. Actual result: In html, a dialog popped up and said "a runtime error has occurred" In pdf, a dialog popped up and said that report parameter has null value. In frameset servlet, both formats are ok. I found that if I set default value for the report parameter in target report, the issue will disappear.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
this.reportDesignName = ParameterAccessor.getParameter(
								request, ParameterAccessor.PARAM_REPORT );
						InputStream is = null;
						URL url = null;
						try
						{
							String reportPath = this.reportDesignName;
							if ( !reportPath.startsWith( "/" ) ) 
								reportPath = "/" + reportPath; 
							url = request.getSession( ).getServletContext( )
									.getResource( reportPath );
							if ( url != null )
								is = url.openStream( );
							if ( is != null )
								reportRunnable = ReportEngineService
										.getInstance( )
										.openReportDesign( url.toString( ), is,
												this.getModuleOptions( request ) );
						}
						catch ( Exception e )
						{
						}
					}
					if ( reportRunnable == null )
					{
						this.exception = new ViewerException(
								ResourceConstants.GENERAL_EXCEPTION_REPORT_FILE_ERROR,
								new String[]{this.reportDesignName} );