fix car

mallinkAdmin/src/main/java/com/iformall/controller/car/WxCarController.java

@@ -18,6 +18,7 @@ import com.iformall.mapper.WxCouponMapper;
 import com.iformall.service.*;
 import com.iformall.service.park.impl.etcp.ETCPUtil;
 import com.iformall.service.park.impl.tjd.TJDUtil;
+import com.iformall.utils.Constant;
 
 import io.swagger.annotations.ApiImplicitParam;
 import io.swagger.annotations.ApiImplicitParams;
@@ -191,6 +192,9 @@ public class WxCarController extends BaseController {
         }
         WxMerchant wxMerchant = wxMerchantService.getById(merchantId);
         String carParams = wxMerchant.getCarParams();
+        if (StringUtils.isBlank(carParams)) {
+        	return Constant.default_business.toString();
+        }
         JSONObject objParams1 = JSON.parseObject(carParams);
         businessId = objParams1.getString("businessId");
         return businessId;