don't send "" for attachments without content

d2m/converters/message-to-event.test.js

@@ -3,6 +3,23 @@ const assert = require("assert")
 const {messageToEvent} = require("./message-to-event")
 const data = require("../../test/data")
 
+test("message2event: attachment with no content", async t => {
+   const events = await messageToEvent(data.message.attachment_no_content, data.guild.general)
+   t.deepEqual(events, [{
+      $type: "m.room.message",
+      msgtype: "m.image",
+      url: "mxc://cadence.moe/qXoZktDqNtEGuOCZEADAMvhM",
+      body: "image.png",
+      external_url: "https://cdn.discordapp.com/attachments/497161332244742154/1124628646431297546/image.png",
+      info: {
+         mimetype: "image/png",
+         w: 466,
+         h: 85,
+         size: 12919,
+      },
+   }])
+})
+
 test("message2event: stickers", async t => {
    const events = await messageToEvent(data.message.sticker, data.guild.general)
    t.deepEqual(events, [{