Document Message v4, remove data-free thumbnails

js/modules/types/message.js

@@ -18,6 +18,9 @@ const PRIVATE = 'private';
 //   - Attachments: Sanitize Unicode order override characters.
 // Version 3
 //   - Attachments: Write attachment data to disk and store relative path to it.
+// Version 4
+//   - Quotes: Write thumbnail data to disk and store relative path to it.
+
 
 const INITIAL_SCHEMA_VERSION = 0;
 
@@ -158,13 +161,19 @@ exports._mapQuotedAttachments = upgradeAttachment => async (message, context) =>
   }
 
   const upgradeWithContext = async (attachment) => {
-    if (!attachment || !attachment.thumbnail) {
+    const { thumbnail } = attachment;
+    if (!thumbnail) {
       return attachment;
     }
 
-    const thumbnail = await upgradeAttachment(attachment.thumbnail, context);
+    if (!thumbnail.data) {
+      console.log('Quoted attachment did not have thumbnail data; removing it');
+      return omit(attachment, ['thumbnail']);
+    }
+
+    const upgradedThumbnail = await upgradeAttachment(thumbnail, context);
     return Object.assign({}, attachment, {
-      thumbnail,
+      thumbnail: upgradedThumbnail,
     });
   };