Coverity scan reported new defects related to daserver.cpp

 *** CID 1535311:  Error handling issues  (UNCAUGHT_EXCEPT)
/home/centos/build/CE/platform/HPCC-Platform/dali/server/daserver.cpp: 445 in main()
439             hpccMetrics::MetricsManager &metricsManager = hpccMetrics::queryMetricsManager();
440             metricsManager.init(pMetricsTree);
441             metricsManager.startCollecting();
442         }
443     }
444
>>>     CID 1535311:  Error handling issues  (UNCAUGHT_EXCEPT)
>>>     In function "main(int, char const **)" an exception of type "std::regex_error" is thrown and never caught.
445     int main(int argc, const char* argv[])
446     {
447         rank_t myrank = 0;
448         const char *server = nullptr;
449         int port = 0;
450