lmirosevic/GBLocation — pull request #3 by pankkor (2014-10-20 21:09:45+00:00)
Title: NSLocationAlwaysUsageDescription or NSLocationWhenInUseUsageDescription can be nil

afaik strings for NSLocationAlwaysUsageDescription or NSLocationWhenInUseUsageDescription key is for providing custom prompt message. If you leave these values empty it just a standard message will be displayed.