[OpenSIPS-Devel] [OpenSIPS/opensips] f81572: str.h: Add some handy zero-string test macros

[Liviu Chircu]

  Branch: refs/heads/feature/freeswitch-extended-integration
  Home:   https://github.com/OpenSIPS/opensips
  Commit: f8157269489c746901089945927ee5ddb1557b6d
      https://github.com/OpenSIPS/opensips/commit/f8157269489c746901089945927ee5ddb1557b6d
  Author: Liviu Chircu <liviu at opensips.org>
  Date:   2017-12-12 (Tue, 12 Dec 2017)

  Changed paths:
    M str.h

  Log Message:
  -----------
  str.h: Add some handy zero-string test macros