fix(接口测试): 修复接口校验url的逻辑

--bug=1025475 --user=王孝刚 【接口测试】创建接口未填写路径-点击保存无提示
https://www.tapd.cn/55049933/s/1363297

api-test/frontend/src/business/definition/components/complete/EditCompleteHTTPApi.vue

@@ -220,7 +220,7 @@ export default {
   },
   data() {
     let validateURL = (rule, value, callback) => {
-      if (!this.httpForm.path.startsWith('/')) {
+      if (!this.httpForm.path || !this.httpForm.path.startsWith('/')) {
         callback(this.$t('api_test.definition.request.path_valid_info'));
       }
       callback();

api-test/frontend/src/business/definition/components/runtest/RunTestHTTPPage.vue

@@ -146,7 +146,7 @@ export default {
   },
   data() {
     let validateURL = (rule, value, callback) => {
-      if (!this.api.request.path.startsWith('/')) {
+      if (!this.api.request.path || !this.api.request.path.startsWith('/')) {
         callback(this.$t('api_test.definition.request.path_valid_info'));
       }
       callback();