修复蓝牙扫描界面不自动扫描的bug

lib/pages/mh_page/device/controller/mht_bluetooth_controller.dart

@@ -189,6 +189,7 @@ class MHTBlueToothController extends GetControllerEx<MHTBlueToothModel> {
         return res;
       } else {
         model.deviceDataStatus = [];
+        return ApiResponse(code:1, msg: "".tr);
       }
     } catch (e) {
       print("获取设备状态异常: $e");
@@ -218,9 +219,9 @@ class MHTBlueToothController extends GetControllerEx<MHTBlueToothModel> {
         "macA": bleDevice.macA,
         if (bleDevice.macB != null && bleDevice.macB!.isNotEmpty)
           "macB": bleDevice.macB,
-        if (bleDevice.name!=null && bleDevice.name!.isNotEmpty) 
-          'param':{
-            'name':bleDevice.name,
+        if (bleDevice.name != null && bleDevice.name!.isNotEmpty)
+          'param': {
+            'name': bleDevice.name,
           },
       };
 
@@ -237,8 +238,8 @@ class MHTBlueToothController extends GetControllerEx<MHTBlueToothModel> {
           // personController.currentPersonId.value = res.data['id'];
           //todo 绑定成功需要返回传感器id
           currentDeviceMac.value = "";
-          if(res.data!=null){
-            if(currentFullDevice!=null){
+          if (res.data != null) {
+            if (currentFullDevice != null) {
               currentFullDevice!.macAID = res.data['macA'];
               currentFullDevice!.macBID = res.data['macB'];
             }

lib/pages/mh_page/device/mht_blueteeth_device_page.dart

@@ -112,6 +112,7 @@ class _MHTBlueteethDevicePageState extends State<MHTBlueteethDevicePage> {
   }
 
   void _startScanning() async {
+    try {
       if (!mounted || isScanning || !mhtBlueToothController.shouldScan.value)
         return;
 
@@ -204,6 +205,13 @@ class _MHTBlueteethDevicePageState extends State<MHTBlueteethDevicePage> {
           });
         }
       }
+    } catch (e) {
+      ef.log("$e");
+    } finally {
+      setState(() {
+        isScanning = false;         
+      });
+    }
   }
 
   void _startPeriodicScan() {