fix(测试跟踪): 编辑测试用例报错问题 (#17976)

--bug=1016836 --user=宋昌昌 【测试跟踪】编辑测试用例报错 https://www.tapd.cn/55049933/s/1244593

Co-authored-by: song-cc-rock <changchang.song@fit2cloud.com>

backend/src/main/java/io/metersphere/base/mapper/ext/ExtCustomFieldResourceMapper.xml

@@ -23,6 +23,9 @@
             <if test="record.textValue != null">
                 text_value = #{record.textValue,jdbcType=LONGVARCHAR},
             </if>
+            <if test="record.value == null and record.textValue == null">
+                `value` = null and text_value = null
+            </if>
         </set>
     </sql>
     <update id="batchUpdateByResourceIds">