search asset ui

lib/views/widgets/qr/asset_scan_qr.dart

@@ -49,7 +49,8 @@ class _AssetScanQrState extends State<AssetScanQr> {
   }
 
   _pickManually() async {
-    await Navigator.push(context, MaterialPageRoute(builder: (context) => const SearchAssetPage()));
+    _controller?.pauseCamera();
+    await Navigator.push(context, MaterialPageRoute(builder: (context) => const SearchAssetPage())).then((value) => _controller?.resumeCamera());
   }
 
   _getDevice(String result, {bool isQr = false}) async {
@@ -79,7 +80,9 @@ class _AssetScanQrState extends State<AssetScanQr> {
                     if (!_scanDone) {
                       _scanDone = true;
                       final result = await _getDevice(scanData.code, isQr: true);
-                      Navigator.of(context).pop(result[0]);
+                      if(result.isNotEmpty) {
+                        Navigator.of(context).pop(result[0]);
+                      }
                     }
                   });
                 },