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Telephony: Return 'null' as per TelephonyManager need
Return 'null' instead of "" (empty string) when Line1AlphaTag,
IccSerialNumber and Msisdn are unavailable.
Bug: 8449375
Change-Id: I5d8052922363f4b3b900bcdea490afe22fedce4f
Change-Id: Iaa77764af8f2c12c11c990c6c23152ba1dac84cb