fix swagger2.0 NullPointException (#1196)

* fix swagger2.0同步时存在$ref参数而dto不存在的情况

* 删除多余代码

* 修复编辑HTTP配置域名为空是，数据库config拼接的json串中domain没有更新为空的情况

* 语法调整

Co-authored-by: fengkaijun <fengkaijun@yingzi.com>

backend/src/main/java/io/metersphere/api/parse/Swagger2Parser.java

@@ -270,7 +270,12 @@ public class Swagger2Parser extends SwaggerAbstractParser {
                         refSet.add(simpleRef);
                         Model model = this.definitions.get(simpleRef);
                         JSONArray propertyList = new JSONArray();
+                        if (model != null) {
                             propertyList.add(getBodyParameters(model.getProperties(), refSet));
+                        } else {
+                            propertyList.add(new JSONObject());
+                        }
+
                         jsonObject.put(key, propertyList);
                     } else {
                         jsonObject.put(key, new ArrayList<>());

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

@@ -49,7 +49,8 @@
       },
       methods: {
         validateSocket(socket) {
-          if (!socket) return true;
+          // if (!socket) return true;
+          if (socket !== ''){
           let urlStr = this.httpConfig.protocol + '://' + socket;
           let url = {};
           try {
@@ -58,7 +59,6 @@
             return false;
           }
           this.httpConfig.domain = decodeURIComponent(url.hostname);
-
           this.httpConfig.port = url.port;
           let path = url.pathname === '/' ? '' : url.pathname;
           if (url.port) {
@@ -67,6 +67,13 @@
             this.httpConfig.socket = this.httpConfig.domain + path;
           }
           return true;
+          }else {
+            this.httpConfig.domain = socket;
+            this.httpConfig.port = '';
+            this.httpConfig.socket = socket;
+            return true;
+          }
+          
         },
         validate() {
           let isValidate = false;