VOL-2518 - reconnect to voltha on disconnect

Change-Id: Ia497bb6a83312f15e54de0d7556753e1d9ef58b0
diff --git a/internal/pkg/openflow/meter.go b/internal/pkg/openflow/meter.go
index d4299ba..61ded75 100644
--- a/internal/pkg/openflow/meter.go
+++ b/internal/pkg/openflow/meter.go
@@ -32,6 +32,12 @@
 				"request":   js})
 	}
 
+	if ofc.VolthaClient == nil {
+		logger.Errorw("no-voltha-connection",
+			log.Fields{"device-id": ofc.DeviceID})
+		return
+	}
+
 	meterModUpdate := openflow_13.MeterModUpdate{Id: ofc.DeviceID}
 	meterMod := openflow_13.OfpMeterMod{
 		MeterId: request.MeterId,