if either fan access or musician access is public, expose rabl VRFS-1427

ruby/lib/jam_ruby/models/music_session.rb

@@ -338,10 +338,9 @@ module JamRuby
 
     # Verifies that the specified user can see this music session
     def can_see? user
-      if self.musician_access
+      if self.musician_access || self.fan_access
         return true
       else
-        # the creator can always see, and the invited users can see it too
         return self.creator == user || self.invited_musicians.exists?(user)
       end
     end