fix(接口测试): 修复swagger导入失败的缺陷

--bug=1026085 --user=王孝刚 [接口测试]github#24323接口导入-导入 Swagger 文件报“格式错误”
https://www.tapd.cn/55049933/s/1377700

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

@@ -55,6 +55,9 @@ public class Swagger2Parser extends SwaggerAbstractParser {
             ObjectMapper objectMapper = new ObjectMapper();
             objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
             try {
+                if (StringUtils.isNotBlank(sourceStr)){
+                    sourceStr = replaceStr(sourceStr);
+                }
                 JsonNode jsonNode = objectMapper.readTree(sourceStr);
                 if (!jsonNode.has("swagger") && !jsonNode.has("openapi")) {
                     MSException.throwException("wrong format");
@@ -82,6 +85,10 @@ public class Swagger2Parser extends SwaggerAbstractParser {
         return definitionImport;
     }
 
+    public static String replaceStr(String sourceStr) {
+        return sourceStr.replaceAll("\"required\": \"(.*?)\"", "\"required\": []");
+    }
+
     // 鉴权设置
     private List<AuthorizationValue> setAuths(ApiTestImportRequest request) {
         List<AuthorizationValue> auths = new ArrayList<>();

backend/src/main/java/io/metersphere/api/dto/definition/parse/Swagger3Parser.java

@@ -509,7 +509,9 @@ public class Swagger3Parser extends SwaggerAbstractParser {
         }
         if (this.components.getSchemas() != null) {
             Schema schema = this.components.getSchemas().get(ref);
-            schema.setName(ref);
+            if (ObjectUtils.isNotEmpty(schema)) {
+                schema.setName(ref);
+            }
             return schema;
         }
         return null;