fix(接口测试): 修复swagger导出问题

--bug=1023848 --user=郭雨琦
https://www.tapd.cn/55049933/bugtrace/bugs/view/1155049933001023848

api-test/backend/src/main/java/io/metersphere/api/parse/api/Swagger3Parser.java

@@ -709,7 +709,9 @@ public class Swagger3Parser extends SwaggerAbstractParser {
             paths.optJSONObject(apiDefinition.getPath()).put(apiDefinition.getMethod().toLowerCase(), methodDetail);
         }
         result.setPaths(JSONUtil.parseObjectNode(paths.toString()));
+        if (CollectionUtils.isNotEmpty(schemas)) {
             components.put("schemas", schemas.get(0));
+        }
         result.setComponents(JSONUtil.parseObjectNode(components.toString()));
         return result;
     }