log: hint when no log

luasrc/model/cbi/AdGuardHome/log.lua

@@ -11,5 +11,6 @@ t.template="AdGuardHome/log"
 t.readonly="readonly"
 local logfile=uci:get("AdGuardHome","AdGuardHome","logfile") or ""
 t.timereplace=(logfile~="syslog" and logfile~="" )
+t.pollcheck=logfile~=""
 fs.writefile("/var/run/lucilogpos","0")
 return f

luasrc/view/AdGuardHome/log.htm

@@ -97,7 +97,12 @@ XHR.poll(3, '<%=url([[admin]], [[services]], [[AdGuardHome]], [[getlog]])%>', nu
 		}
 	}
 );}
+<%if self.pollcheck then%>
 poll_check();
+<%else%>
+var lv = document.getElementById('cbid.logview.1.conf');
+lv.innerHTML="<%:Please add log path in config to enable log%>"
+<%end%>
 //]]>
 </script>	
 <%+cbi/valuefooter%>

po/zh-cn/AdGuardHome.po

@@ -209,4 +209,7 @@ msgid "Del gfwlist"
 msgstr "删除gfw列表"
 
 msgid "Del"
-msgstr "删除"
+msgstr "删除"
+
+magid "Please add log path in config to enable log"
+msgstr "请在设置里填写日志路径以启用日志"