Fix two small PHP errors

app/Post.php

@@ -689,7 +689,7 @@ class Post extends Model
 
             if (in_array($att->rel, ['enclosure', 'related', 'alternate'])) {
                 $atte = new Attachment;
-                $atte->rel = $enc['rel'];
+                $atte->rel = $att->rel;
                 $atte->category = 'embed';
 
                 // Youtube

src/Moxl/Xec/Payload/MAMResult.php

@@ -24,6 +24,11 @@ class MAMResult extends Payload
             $message = \App\Message::findByStanza($stanza, $parent);
             $message = $message->set($stanza->forwarded->message, $stanza->forwarded);
 
+            // parent message doesn't exists
+            if ($message == null) {
+                return;
+            }
+
             if (
                 $message->published && strtotime($message->published) > mktime(0, 0, 0, gmdate("m"), gmdate("d") - 3, gmdate("Y"))
             ) {
@@ -68,11 +73,6 @@ class MAMResult extends Payload
                 }
             }
 
-            // parent message doesn't exists
-            if ($message == null) {
-                return;
-            }
-
             if ($message->isMuc()) {
                 $message->jidfrom = baseJid(($message->jidfrom));
             }