Fixing type/isinstance error.
Fixing type/isinstance error.

Removing object_id from filtering, because it doesn't make sense to have
it without content_type, and it is not required by MyData.  The content_type
foreign key could be added to ObjectAclResource, but we don't have time
to get too hung up on this right now, as there's a lot more to do to get
MyData talking to MyTardis's develop branch's API.

pansapiens/mytardis,pansapiens/mytardis,pansapiens/mytardis,pansapiens/mytardis