fix(项目设置): 修复删除环境变量会把空变量删除的缺陷

--bug=1033014 --user=王孝刚 【项目设置】项目环境-删除变量时-把空白输入框删除掉了
https://www.tapd.cn/55049933/s/1437743

framework/sdk-parent/frontend/src/components/environment/commons/ApiScenarioVariables.vue

@@ -256,13 +256,18 @@ export default {
   methods: {
     remove: function (index) {
       const dataIndex = this.pageData.findIndex((d) => d.name === index.name);
-      this.pageData.splice(dataIndex, 1);
+      if (dataIndex !== -1) {
+        this.pageData.splice(dataIndex, 1);
+      }
 
       const allDataIndex = this.allData.findIndex((d) => d.name === index.name);
-      this.allData.splice(allDataIndex, 1);
-
+      if (allDataIndex !== -1) {
+        this.allData.splice(allDataIndex, 1);
+      }
       const itemsIndex = this.items.findIndex((d) => d.name === index.name);
-      this.items.splice(itemsIndex, 1);
+      if (itemsIndex !== -1) {
+        this.items.splice(itemsIndex, 1);
+      }
       this.sortParameters();
       this.queryPage();
     },