fix(测试跟踪): 没有填写第三方平台账号信息，创建TAPD缺陷报错

--bug=1021427 --user=陈建星 【测试跟踪】缺陷管理-提交缺陷到azure失败 https://www.tapd.cn/55049933/s/1321476

test-track/backend/src/main/java/io/metersphere/service/wapper/UserService.java

@@ -19,7 +19,11 @@ public class UserService {
     UserMapper userMapper;
 
     public UserDTO.PlatformInfo getCurrentPlatformInfo(String workspaceId) {
-        return JSON.parseObject(getCurrentPlatformInfoStr(workspaceId), UserDTO.PlatformInfo.class);
+        String currentPlatformInfoStr = getCurrentPlatformInfoStr(workspaceId);
+        if (StringUtils.isNotBlank(currentPlatformInfoStr)) {
+            JSON.parseObject(currentPlatformInfoStr, UserDTO.PlatformInfo.class);
+        }
+        return null;
     }
 
     public String  getCurrentPlatformInfoStr(String workspaceId) {