Fix "Reminder needs content".

Certain fields were not being checked correctly for content.

web/static/js/main.js

@@ -308,15 +308,17 @@ async function serialize_reminder(node, mode) {
     const embed_title = node.querySelector('textarea[name="embed_title"]').value;
 
     if (
-        attachment === null &&
         content.length == 0 &&
-        embed_author_url === null &&
         embed_author.length == 0 &&
+        embed_title.length == 0 &&
         embed_description.length == 0 &&
         embed_footer.length == 0 &&
+        embed_author_url === null &&
         embed_footer_url === null &&
         embed_image_url === null &&
-        embed_thumbnail_url === null
+        embed_thumbnail_url === null &&
+        fields.length == 0 &&
+        attachment === null
     ) {
         return { error: "Reminder needs content." };
     }