User specific motd changes (again)

stable.user.js

@@ -128,7 +128,7 @@
   const minMessageOpacity = 0.2
   let infoExpireTime = 60 // Every n seconds basic info should be loaded from server
   var motd = ''
-  var userSpecificMotd = {}
+  var userSpecificMotd = undefined
   var lastestVersion = ''
   var subjInfo
 
@@ -1140,13 +1140,16 @@
         if (getUid() !== inf.uid) {
           setVal('userId', inf.uid)
         }
-        userSpecificMotd = inf.userSpecificMotd
         subjInfo = inf.subjinfo
         setVal('userId', inf.uid)
-
+        userSpecificMotd = inf.userSpecificMotd
+        if (userSpecificMotd) {
+          overlay.querySelector('#mailButton').style.cursor = 'pointer'
           overlay.querySelector('#mailButton').innerText = userSpecificMotd.seen
             ? '📭'
             : '📬'
+        }
+
         overlay.querySelector('#infoMainDiv').innerText = `${
           subjInfo.subjects
         } tárgy, ${subjInfo.questions} kérdés. User ID: ${getUid()}`
@@ -1970,7 +1973,6 @@
       mailButton.setAttribute('id', 'mailButton')
       SetStyle(mailButton, {
         fontSize: '30px',
-        cursor: 'pointer',
         position: 'absolute',
         left: '0px',
         bottom: '0px',
@@ -1979,17 +1981,19 @@
       })
       mailButton.addEventListener('mousedown', e => {
         e.stopPropagation()
-        if (!userSpecificMotd.seen) {
+        if (userSpecificMotd && !userSpecificMotd.seen) {
           mailButton.innerText = '📭'
-          clearAllMessages()
-          ShowMessage(
-            'Üzenet oldal készítéjétől (csak te látod):\n' +
-              userSpecificMotd.msg
-          )
           post('infos', {
             userSpecificMotdSeen: true,
           })
         }
+        if (!userSpecificMotd) {
+          return
+        }
+        clearAllMessages()
+        ShowMessage(
+          'Üzenet oldal készítéjétől (csak te látod):\n' + userSpecificMotd.msg
+        )
       })
 
       var tbl = document.createElement('table')