fix(接口测试): 高级搜索标签数量小于临界值搜索问题

--bug=1047918 --user=宋昌昌 【接口测试】定义-CASE/MOCK-高级搜索-标签 数量小于 0-搜索应该显示暂无数据 https://www.tapd.cn/55049933/s/1596794

backend/services/system-setting/src/main/java/io/metersphere/system/mapper/BaseMapper.xml

@@ -166,8 +166,13 @@
                     JSON_LENGTH(${column}) > #{condition.value}
                 </when>
                 <when test="${condition}.operator == 'COUNT_LT'">
+                    <if test="${condition}.value == 0">
+                        1=2
+                    </if>
+                    <if test="${condition}.value != 0">
                         ${column} is null or ${column} = '[]' or
                         JSON_LENGTH(${column}) &lt; #{condition.value}
+                    </if>
                 </when>
                 <when test="${condition}.operator == 'EMPTY'">
                     ${column} is null or ${column} = '[]'