re-scan

lib/views/widgets/qr/asset_scan_qr.dart

@@ -82,6 +82,8 @@ class _AssetScanQrState extends State<AssetScanQr> {
                       final result = await _getDevice(scanData.code, isQr: true);
                       if(result.isNotEmpty) {
                         Navigator.of(context).pop(result[0]);
+                      }else{
+                        _scanDone = false;
                       }
                     }
                   });