Story SW-300: fixes the fact that you cannot insert the same test twice

LCU/Maintenance/DBInterface/monitoringdb/serializers/rtsm.py

@@ -21,7 +21,8 @@ class RTSMObservationSerializer(serializers.ModelSerializer):
     def create(self, validated_data):
         rtsm_errors = validated_data.pop('errors')
         try:
-         element = RTSMObservation.objects.filter(start_time=validated_data['start_time'], station_name=validated_data['station_name']).get(pk=1)
+         element = RTSMObservation.objects.filter(start_time=validated_data['start_time'],
+                                                  station_name=validated_data['station_name']).first()
 
          return element
         except Exception as e:

LCU/Maintenance/DBInterface/monitoringdb/serializers/stationtest.py

@@ -40,7 +40,7 @@ class StationTestSerializer(serializers.ModelSerializer):
 
         try:
             element = StationTest.objects.filter(start_time=validated_data['start_time'],
-                                                 station_name=validated_data['station_name']).get(id=0)
+                                                 station_name=validated_data['station_name']).first()
             return element
         except ObjectDoesNotExist:
             logger.info('station test not found inserting %s', validated_data)