Per #2701, every time I run ascii2nc to I see a log message for 'DEBU…

…G 1: Number of NDBC skipped files due to no lookup 0'. This is printed by the NdbcHandler destructor. Update the logic to only print a debug level 3 log message when the number of missing locations is greater than 0, 'DEBUG 3: Skipped 5 NDBC files whose locations are not defined in 'MET_BASE/table_files/ndbc_stations.xml'. Set the MET_NDBC_STATIONS environment variable to override this file.'

src/tools/other/ascii2nc/ndbc_handler.cc

@@ -120,8 +120,15 @@ NdbcHandler::NdbcHandler(const string &program_name) :
 
 NdbcHandler::~NdbcHandler()
 {
-  mlog << Debug(1) << "Number of NDBC skipped files due to no lookup " <<  numMissingStations
-       << "\n";
+
+   // Log the non-zero number of missing stations
+   if(numMissingStations > 0) {
+      mlog << Debug(3) << "Skipped " << numMissingStations
+           << " NDBC files whose locations are not defined in \""
+           << locationsFileName << "\". Set the " << stations_env
+           << " environment variable to provide an updated "
+           << "locations file.\n";
+   }
 }