[OpenSIPS-Devel] [OpenSIPS/opensips] 1f1414: Fix optional param for forward()

[Bogdan Andrei IANCU]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 1f1414a3806649cb459542900ae8647c210f61a1
      https://github.com/OpenSIPS/opensips/commit/1f1414a3806649cb459542900ae8647c210f61a1
  Author: Bogdan-Andrei Iancu <bogdan at opensips.org>
  Date:   2020-08-14 (Fri, 14 Aug 2020)

  Changed paths:
    M core_cmds.c

  Log Message:
  -----------
  Fix optional param for forward()

If missing, there is nothing to be done for the parameter.

Closes #2210

(cherry picked from commit 5206467cfff481c62ad23147cca86db64d770c20)