fedimbed: dont error on weird attachment structures

src/modules/fedimbed.js

@@ -508,7 +508,7 @@ async function processUrl(msg, url, spoiler = false) {
             type: attachment.mediaType,
           });
         }
-      } else {
+      } else if (attachment.url) {
         const contentType = await fetch(attachment.url, {
           method: "HEAD",
         }).then((res) => res.headers.get("Content-Type"));
@@ -572,6 +572,10 @@ async function processUrl(msg, url, spoiler = false) {
             });
           }
         }
+      } else {
+        logger.warn(
+          `Unhandled attachment structure! ${JSON.stringify(attachment)}`
+        );
       }
     }