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Previously these two dialplan functions would issue warnings and return failure when an empty string is used as the argument. Now they will not issue a warning and will successfully return an empty string. ASTERISK-23911 #close Reported by: Matt Jordan Review: https://reviewboard.asterisk.org/r/3745/ git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@418641 65c4cc65-6c06-0410-ace0-fbb531ad65f3