make get_current_post_id_and_frame explicitly return [null, null] on no results (this is what it was doing already); fixup hashchange_post_id to understand this
make get_current_post_id_and_frame explicitly return [null, null] on no results (this is what it was doing already); fixup hashchange_post_id to understand this

--HG--
branch : moe
extra : convert_revision : svn%3A2d28d66d-8d94-df11-8c86-00306ef368cb/trunk/moe%40877

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