fix(接口测试): 修复swagger文件导入失败的缺陷

--bug=1025299 --user=王孝刚 【接口测试】github#23524，swagger文件导入不成功
https://www.tapd.cn/55049933/s/1361285

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

@@ -428,6 +428,7 @@ public class Swagger2Parser extends SwaggerAbstractParser {
             body.setFormat("JSON-SCHEMA");
         } else if (body.getType().equals(Body.WWW_FROM) || body.getType().equals(Body.FORM_DATA)) {
             String parameterStr = parseSchema(bodyParameter.getSchema());
+            if (StringUtils.isNotBlank(parameterStr)) {
                 JSONObject jsonObject = JSONUtil.parseObject(parameterStr);
                 Set<String> strings = jsonObject.keySet();
                 List<KeyValue> kvs = new ArrayList<>();
@@ -436,6 +437,7 @@ public class Swagger2Parser extends SwaggerAbstractParser {
                     kvs.add(keyValue);
                 }
                 body.setKvs(kvs);
+            }
         } else {
             body.setRaw(parseSchema(bodyParameter.getSchema()));
         }

api-test/backend/src/main/java/io/metersphere/service/MockConfigService.java

@@ -828,7 +828,7 @@ public class MockConfigService {
         String urlPrefix = "/mock/" + projectId + "/";
         String requestUri = request.getRequestURI();
         String[] urlParamArr = requestUri.split(urlPrefix);
-        return urlParamArr[urlParamArr.length - 1];
+        return urlParamArr.length == 0 ? "" : urlParamArr[urlParamArr.length - 1];
     }
 
     public MockConfigResponse findByApiId(String id) {