[VOL-4595] Get image status of all ONUs if no deviceId is provided

Change-Id: I0ea0793e5703a8ebb27dcbdfc570522f50d2018c
diff --git a/rw_core/core/device/manager.go b/rw_core/core/device/manager.go
index c8322a2..7d6e9da 100755
--- a/rw_core/core/device/manager.go
+++ b/rw_core/core/device/manager.go
@@ -774,7 +774,7 @@
 }
 
 func (dMgr *Manager) validateImageRequest(request *voltha.DeviceImageRequest) error {
-	if request == nil || len(request.DeviceId) == 0 || request.DeviceId[0] == nil {
+	if request == nil {
 		return status.Errorf(codes.InvalidArgument, "invalid argument")
 	}