fix(用例管理): 修复查询用例等级失败问题

--bug=1045203 --user=郭雨琦 https://www.tapd.cn/55049933/bugtrace/bugs/view/1155049933001045203

backend/services/case-management/src/main/java/io/metersphere/functional/dto/FunctionalCaseCustomFieldDTO.java

@@ -38,4 +38,7 @@ public class FunctionalCaseCustomFieldDTO implements Serializable {
     @Schema(title = "字段类型")
     private String type;
 
+    @Schema(title = "字段key名")
+    private String internalFieldKey;
+
 }

backend/services/case-management/src/main/java/io/metersphere/functional/excel/listener/FunctionalCaseImportEventListener.java

@@ -414,6 +414,10 @@ public class FunctionalCaseImportEventListener extends AnalysisEventListener<Map
      * @param errMsg
      */
     private void validateTags(FunctionalCaseExcelData data, StringBuilder errMsg) {
+        if (StringUtils.isBlank(data.getTags())) {
+            data.setTags(StringUtils.EMPTY);
+            return;
+        }
         List<String> tags = functionalCaseService.handleImportTags(data.getTags());
         if (tags.size() > TAGS_COUNT) {
             errMsg.append(Translator.get("tags_count"))
@@ -425,7 +429,6 @@ public class FunctionalCaseImportEventListener extends AnalysisEventListener<Map
                 errMsg.append(Translator.get("tag_length"))
                         .append(ERROR_MSG_SEPARATOR);
             }
-            return;
         });
     }
 

backend/services/case-management/src/main/java/io/metersphere/functional/mapper/ExtFunctionalCaseCustomFieldMapper.xml

@@ -26,7 +26,8 @@
         fccf.`value` defaultValue,
         cf.NAME fieldName,
         cf.internal internal,
-        cf.type type
+        cf.type type,
+        cf.NAME internalFieldKey
         FROM
         functional_case_custom_field fccf
         INNER JOIN custom_field cf ON fccf.field_id = cf.id