_unset attribute added to RequestData class.
_unset attribute added to RequestData class.

It will be used to identify fields which have not been set in a similar way how "unset" object is used by the access checker. Please see line 248 in soc.views.helper.access_checker.

rhyolight/nupic.son,rhyolight/nupic.son,rhyolight/nupic.son