fix(接口定义): 修复批量添加请求头未校验空值的缺陷

--bug=1016057 --user=王孝刚
接口测试/接口定义/编辑接口/TEST_在TEST页面的环境配置处点击批量添加，输入key点击确定按钮，弹框关闭后，请求头位置新增一栏，但显示key值为空
https://www.tapd.cn/55049933/s/1228341

frontend/src/business/components/api/automation/scenario/variable/VariableList.vue

@@ -148,7 +148,7 @@
             <el-tooltip class="item-tabs" effect="dark" :content="$t('api_test.request.headers')" placement="top-start"
                         slot="label">
           <span>{{ $t('api_test.request.headers') }}
-            <div class="el-step__icon is-text ms-api-col" v-if="headers.length>1">
+            <div class="el-step__icon is-text ms-api-col ms-header" v-if="headers.length>1">
               <div class="el-step__icon-inner">{{ headers.length - 1 }}</div>
             </div>
           </span>
@@ -655,4 +655,13 @@ fieldset {
   display: none !important;
 }
 
+.ms-header {
+  background: #783887;
+  color: white;
+  height: 18px;
+  font-size: xx-small;
+  border-radius: 50%;
+}
+
+
 </style>

frontend/src/business/components/api/test/components/environment/ApiScenarioVariables.vue

@@ -80,7 +80,7 @@
             </el-tooltip>
             <el-tooltip effect="dark" :content="$t('schema.adv_setting')" placement="top-start">
               <el-button icon="el-icon-setting" circle size="mini" style="margin-left: 10px"
-                         @click="openSetting(scope.row)" v-if="scope.row.type !=='LIST'"/>
+                         @click="openSetting(scope.row)" v-if="scope.row.type !=='LIST'" @change="change"/>
             </el-tooltip>
 
           </span>

frontend/src/business/components/api/test/components/environment/EnvironmentHttpConfig.vue

@@ -451,6 +451,7 @@ export default {
       let params = data.split("\n");
       let keyValues = [];
       params.forEach(item => {
+        if (item) {
           let line = item.split(/：|:/);
           let values = item.split(line[0] + ":");
           let required = false;
@@ -465,6 +466,7 @@ export default {
             enable: true,
             contentType: "text/plain"
           }));
+        }
       });
       return keyValues;
     },