getlantern/lantern#1969 Not returning any friends until load succeeds

Closes #1969 

I should note that I tested this to make sure that the happy path works (bring up friends dialog, add friend, reject friend).  The only way that I was able to reproduce the bug itself was by messing with the logic on the client that distinguishes between a known friend and a new suggestion.
Note - this won't interrupted any pending load.  That is no worse than previously, but it doesn't solve any existing problems.