Issue #3504372: Improve errors in private messages when the user logouts out in another page.

Closes #3504372

js/private_message_inbox_block.js

@@ -84,6 +84,10 @@
       Drupal.ajax({
         url: drupalSettings.privateMessageInboxBlock.loadNewUrl,
         submit: { ids },
+        error: (err) => {
+          window.location.reload();
+          console.error(err);
+        },
       })
         .execute()
         .always(() => {
@@ -154,6 +158,10 @@
           timestamp: oldestTimestamp,
           count: drupalSettings.privateMessageInboxBlock.threadCount,
         },
+        error: (err) => {
+          window.location.reload();
+          console.error(err);
+        },
       })
         .execute()
         .always(() => {