[Commits] [wesnoth/wesnoth] b68a23: attempt to fix issue #1820

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/wesnoth/wesnoth
  Commit: b68a23c4802e13121836df88ea353db7d01ad3bb
      https://github.com/wesnoth/wesnoth/commit/b68a23c4802e13121836df88ea353db7d01ad3bb
  Author: gfgtdf <daniel.gfgtdf at gmail.com>
  Date:   2017-07-11 (Tue, 11 Jul 2017)

  Changed paths:
    M src/gui/dialogs/unit_advance.cpp

  Log Message:
  -----------
  attempt to fix issue #1820

`iter->get("description")` might return nullptr so. Also contains some small cleanups.