fixes invalid valud/timestamp order

pkg/tsdb/models/proxy/wrapper.go

@@ -77,9 +77,11 @@ func (tw *TsdbWrapper) Query(ctx context.Context, ds *models.DataSource, query *
 			points := tsdb.TimeSeriesPoints{}
 
 			for _, p := range s.Points {
-				po := tsdb.NewTimePoint(null.FloatFrom(float64(p.Timestamp.Nanos)), p.Value)
+				if p.Timestamp != nil {
+					po := tsdb.NewTimePoint(null.FloatFrom(p.Value), float64(p.Timestamp.Seconds))
 					points = append(points, po)
 				}
+			}
 
 			res.Results[r.RefId].Series = append(res.Results[r.RefId].Series, &tsdb.TimeSeries{
 				Name:   s.Name,