Ensure @oldpage is not nil before trying to diff it.
Ensure @oldpage is not nil before trying to diff it.

moebooru/moebooru,nanaya/moebooru,nanaya/moebooru,euank/moebooru-thin,nanaya/moebooru,moebooru/moebooru,euank/moebooru-thin,moebooru/moebooru,euank/moebooru-thin,moebooru/moebooru,nanaya/moebooru,moebooru/moebooru,euank/moebooru-thin,nanaya/moebooru,euank/moebooru-thin