[OpenSIPS-Devel] [OpenSIPS/opensips] 1d238b: make contrib: Fix error when /doc has no commits

[Liviu Chircu]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 1d238b899a4fa64f32d96a5c8ec473a3341b8d7b
      https://github.com/OpenSIPS/opensips/commit/1d238b899a4fa64f32d96a5c8ec473a3341b8d7b
  Author: Liviu Chircu <liviu at opensips.org>
  Date:   2020-02-10 (Mon, 10 Feb 2020)

  Changed paths:
    M doc/build-contrib.sh

  Log Message:
  -----------
  make contrib:  Fix error when /doc has no commits

Also re-generate the "average commit" project statistics