iziz/libPhoneNumber-iOS — pull request #31 by hashier (2014-10-16 12:04:41+00:00)
Title: Fixes: iOS 7 returns @"" instead of nil if sim card is missing

iOS 7 returns on isoCountryCode a empty string, the documentation says
it should return nil on missing sim card.
iOS 8 behaves correctly and returns nil if no sim card is present.