Fixing deserialization of Weather data

src/main/java/no/nibio/vips/model/oatfloweringmodel/OatFloweringModel.java

@@ -216,7 +216,7 @@ public class OatFloweringModel extends I18nImpl implements Model{
         this.TM = new ArrayList();
         ObjectMapper mapper = new ObjectMapper();
         
-        List<WeatherObservation> observations = mapper.convertValue(config.getConfigParameter("observations"), new TypeReference<List<WeatherObservation>>(){});
+        List<WeatherObservation> observations = this.modelUtil.extractWeatherObservationList(config.getConfigParameter("observations"));
         
         // Must be complete set of daily mean temperatures
         WeatherUtil wUtil = new WeatherUtil();