Error when adding function filter will persist

When an exception occurred while adding a filter in the report viewer, the error was shown but cleared due to an immediate refresh of the parent section. Analysis found that step2 of pzGetFiltersFromContent was failing, after which the error was shown, the section reload happened, and the error disappeared. To resolve the error being cleared prematurely, the pzOnLoadReloadReport control has been modified so that when there are messages on the top level page (pyReportContentPage), a parameter will be set on HarnessContextMgr to not to clear them during the next refresh call.