Bug 131245 [Smoke][Regression]Run Report window in Web View cannot display existed parameteres.
Description: Run Report window in Web View cannot display existed parameteres. Steps to reproduce: 1. New a parameter. 2. Preview in Web Viewer 3. Click Run Report button. Result: No parameter showed.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
{
			this.reportDocumentInstance = ReportEngineService.getInstance( ).openReportDocument( this.reportDocumentName );
			if ( this.reportDocumentInstance == null )
			{
				this.exception = new Exception( "Can not open report doc from " 
						+ ParameterAccessor.getReportDocument( request ) );
				return;
			}
			
			this.reportRunnable = this.reportDocumentInstance.getReportRunnable( );
		}
		else
		{
			try
			{
				this.reportRunnable = ReportEngineService.getInstance( ).
					openReportDesign( ParameterAccessor.getReport( request ) );
			}
			catch ( EngineException e )
			{
				this.exception = e;
				return;
			}
		}
		
		if ( this.reportRunnable == null )
		{
			this.exception = new Exception( "Can not get report runnable" ); 
			return;
		}