Making sure the model handles no observations without throwing an error

src/main/java/no/nibio/vips/model/psilarosaeobservationmodel/PsilaRosaeObservationModel.java

@@ -247,10 +247,6 @@ public class PsilaRosaeObservationModel  extends I18nImpl implements Model{
     public void setConfiguration(ModelConfiguration config) throws ConfigValidationException {
         this.getObjectMapper().configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
         this.pestObservations = this.getObjectMapper().convertValue(config.getConfigParameter("pestObservations"), new TypeReference<List<ObservationImpl>>(){});
-        if(this.pestObservations == null || this.pestObservations.isEmpty())
-        {
-            throw new ConfigValidationException("ERROR: No observations");
-        }
         Collections.sort(this.pestObservations);
         // Setting timezone
         this.timeZone = TimeZone.getTimeZone((String) config.getConfigParameter("timeZone"));
@@ -292,6 +288,10 @@ public class PsilaRosaeObservationModel  extends I18nImpl implements Model{
     }
     
     public Observation getObservationAtDate(Date currentDate) {
+        if(this.pestObservations == null || this.pestObservations.isEmpty())
+        {
+            return null;
+        }
         for(Observation obs:this.pestObservations)
         {
             if(this.weatherUtil.normalizeToExactDate(obs.getTimeOfObservation(), timeZone).compareTo(currentDate) == 0)
@@ -321,6 +321,10 @@ public class PsilaRosaeObservationModel  extends I18nImpl implements Model{
     }
     
     public Observation getObservationValidForDate(Date currentDate) {
+        if(this.pestObservations == null || this.pestObservations.isEmpty())
+        {
+            return null;
+        }
         Long currentTime = currentDate.getTime();
         Observation currentObservation = null;
         for(Observation obs:this.pestObservations)