refactor(接口定义): 修复接口导入选择har控制台报错的缺陷 (#15722)

--bug=1014803 --user=王孝刚 【接口测试】覆盖模式，不选择模块，导入har格式接口，console有报错，页面没反应
https://www.tapd.cn/55049933/s/1200145

Co-authored-by: wxg0103 <727495428@qq.com>

frontend/src/business/components/api/definition/components/import/ApiImport.vue

@@ -466,7 +466,7 @@ export default {
       if (this.currentModule) {
         param.modeId = this.formData.modeId
       }
-      if (this.formData.moduleId.length === 0) {
+      if (this.formData.moduleId && this.formData.moduleId.length === 0) {
         param.moduleId = ''
       }
       param.projectId = this.projectId;