Bugfix: npe if resetting field_search with ruby 1.9.2
Bugfix: npe if resetting field_search with ruby 1.9.2

ajacksified/active_scaffold,asoltys/active_scaffold,BookingBug/active_scaffold,vhochstein/active_scaffold,silverpond/active_scaffold,ajacksified/active_scaffold,vhochstein/active_scaffold,silverpond/active_scaffold,silverpond/active_scaffold,asoltys/active_scaffold,vhochstein/active_scaffold,BookingBug/active_scaffold,BookingBug/active_scaffold