fix(缺陷管理): 高级搜索日期类型字段筛选问题

--bug=1048327 --user=宋昌昌 【缺陷管理】缺陷-高级搜索-jira截止日期字段-筛选不到数据 https://www.tapd.cn/55049933/s/1601908

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

@@ -122,6 +122,13 @@
                                 <property name="column" value="value"/>
                             </include>
                         </when>
+                        <when test="condition.customFieldType != null and
+                        (condition.customFieldType == 'DATE' or condition.customFieldType == 'DATETIME')">
+                            <include refid="io.metersphere.system.mapper.BaseMapper.condition">
+                                <property name="condition" value="condition"/>
+                                <property name="column" value="UNIX_TIMESTAMP(`value`) * 1000"/>
+                            </include>
+                        </when>
                         <otherwise>
                             <include refid="io.metersphere.system.mapper.BaseMapper.condition">
                                 <property name="condition" value="condition"/>
@@ -263,10 +270,10 @@
                     ${column} between #{condition.value[0]} and #{condition.value[1]}
                 </when>
                 <when test="${condition}.operator == 'GT'">
-                    ${column} &gt; #{condition.value}
+                    ${column} is not null and ${column} != '' and ${column} &gt; #{condition.value}
                 </when>
                 <when test="${condition}.operator == 'LT'">
-                    ${column} &lt; #{condition.value}
+                    ${column} is not null and ${column} != '' and ${column} &lt; #{condition.value}
                 </when>
                 <when test="${condition}.operator == 'COUNT_GT'">
                     JSON_LENGTH(${column}) &gt; #{condition.value}