[OpenSIPS-Devel] [OpenSIPS/opensips] af686b: fix passing NULL values for route param

[Razvan Crainea]

  Branch: refs/heads/2.2
  Home:   https://github.com/OpenSIPS/opensips
  Commit: af686b991e4846ce6ad9b02da533955ba3ecc97b
      https://github.com/OpenSIPS/opensips/commit/af686b991e4846ce6ad9b02da533955ba3ecc97b
  Author: Razvan Crainea <razvan at opensips.org>
  Date:   2018-02-13 (Tue, 13 Feb 2018)

  Changed paths:
    M cfg.y

  Log Message:
  -----------
  fix passing NULL values for route param

(cherry picked from commit 25d6396eac8bd0bc96eab5d983c0d40f217cea72)