Check string variable against both empty and null string
The new RIL in O changes all null strings to empty strings, but the code only checks some string variable against null in some areas of frameworks/ opt/telephony. This CL adds the check against both empty and null for these strings. Test: TreeHugger Bug: 62490549 Change-Id: If18154e896666eb9d5398181b9efe7cce40d7f75
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