Bug 199714 NPE with invalid url[0002]
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
SessionHandle sessionHandle = new DesignEngine( null )
				.newSessionHandle( ULocale.US );
		ReportDesignHandle handle = null;
		try
		{
			
			handle = sessionHandle.openDesign( reportConfigName );
			
			if ( handle != null )
			{
				String displayTextParam = null;
				Iterator configVars = handle.configVariablesIterator( );
				while ( configVars != null && configVars.hasNext( ) )
				{
					ConfigVariableHandle configVar = (ConfigVariableHandle) configVars
							.next( );
					if ( configVar != null )
					{
						String varName = configVar.getName( );
						Object varValue = configVar.getValue( );
						if ( varName == null || varValue == null )
							continue;
						String tempName = varName;
						String paramName = null;
						
						if ( varName.toLowerCase( ).startsWith(
								ParameterAccessor.PARAM_ISNULL ) )
						{
							tempName = (String) varValue;
						}