[OpenSIPS-Devel] [OpenSIPS/opensips] ac91c5: fix passing NULL values for route param

[Razvan Crainea]

  Branch: refs/heads/2.3
  Home:   https://github.com/OpenSIPS/opensips
  Commit: ac91c5732a7e6f69225f4caf5c16c43cf90a7be0
      https://github.com/OpenSIPS/opensips/commit/ac91c5732a7e6f69225f4caf5c16c43cf90a7be0
  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)