Ref T786, fixed weather sample

* RR found that no alt value means a huge number of grid points is parsed
* see https://discordapp.com/channels/539048679160676382/539925070550794240/701762348506939693

samples/weatherdata/main.cpp

@@ -33,7 +33,6 @@ int main(int argc, char *argv[])
     BlackMisc::registerMetadata();
     CLogHandler::instance()->install(true);
     CLogHandler::instance()->enableConsoleOutput(false); // default disable
-    BlackMisc::registerMetadata();
 
     CLineReader lineReader(&a);
     CWeatherDataPrinter printer(&a);