solved issue 153
153) problem with google+ friend request to a stalker
     1) a Google+ stalker was displayed in users/index page (friends=all)
     2) app friend request was sent to Stalker
     error1 (Gofreerev A): accept friend request. invalid request. Did not find any mutual friends between @user2 117657151428689087350/google_oauth2 Jan R and login_user 109316109373670614208/google_oauth2 Gofreerev A
     error2 (Jan R):stalker was remove from users/index page (friends=all)
solution. ignore app_friend code 'R' - friend request and 'P' - pending friend request when caching friends information