fix wrong error message (c&p error)
the friends-API returns a different profile object than the profile-API (anime-/mangastats as empty array, not object), so this needs to be handled separately :(
would be much better if
a) the friends-APIs profile object would not contain these elements (they are empty anyway) or
b) if there could be stats, they should be an object as in the profile-API (and simply be null if not available)
fix possible NPE