Search tests which used on-the-fly indexing were hitting deadlocks under

the new haystack version. The problem here was that our indexing

templates were calling get_profile, which would end up creating new

profile objects if they didn't already exist. This would attempt to

write from inside the indexer stack, which would hit a lock.
I've added a new helper that can check if a profile is public without

creating ones that don't exist. Other related code has been updated to

use this new helper appropriately instead of reinventing the wheel.

Ran unit tests.