- don't call FETCH for empty (size=0) message parts

program/steps/mail/func.inc

@@ -987,7 +987,7 @@ function rcmail_message_body($attrib)
       {
       if ($part->type == 'headers')
         $out .= rcmail_message_headers(sizeof($header_attrib) ? $header_attrib : NULL, $part->headers);
-      else if ($part->type == 'content')
+      else if ($part->type == 'content' && $part->size)
         {
         if (empty($part->ctype_parameters) || empty($part->ctype_parameters['charset']))
           $part->ctype_parameters['charset'] = $MESSAGE->headers->charset;

program/steps/mail/get.inc

@@ -113,7 +113,7 @@ else if ($pid = get_input_value('_part', RCUBE_INPUT_GET)) {
       // turn off output buffering and print part content
       if ($part->body)
         echo $part->body;
-      else
+      else if ($part->size)
         $IMAP->get_message_part($MESSAGE->uid, $part->mime_id, $part, true);
     }