If the message is single mime part and non-text, show it as an empty message with an attachment, instead of not displaying anything at all.

program/lib/mime.inc

@@ -108,7 +108,7 @@ function iml_GetPartArray($a, $part){
 		}
 		//echo "s - part: $part rest: $rest array: ".implode(" ", $a)."<br>\n";
 		if (is_array($a[$part-1])) return $a[$part-1];
-		else return false;
+		else return $a;
 	}else if (($part==0) || (empty($part))){
 		return $a;
 	}

program/steps/mail/func.inc

@@ -1004,6 +1004,18 @@ function rcmail_parse_message(&$structure, $arg=array(), $recursive=FALSE)
       }
     }
 
+  // message is single part non-text
+  else
+    {
+    if (($fname = $structure->d_parameters['filename']) ||
+        ($fname = $structure->ctype_parameters['name']) ||
+        ($fname = $structure->headers['content-description']))
+      {
+      $structure->filename = rcube_imap::decode_mime_string($fname);
+      $a_attachments[] = $structure;
+      }
+    }
+
   return array($a_return_parts, $a_attachments);
   }