[Commits] [wesnoth/wesnoth] b1ea09: Small fixup to 42f087abb

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/wesnoth/wesnoth
  Commit: b1ea099da4d6731f61a70578605b69bed896a04e
      https://github.com/wesnoth/wesnoth/commit/b1ea099da4d6731f61a70578605b69bed896a04e
  Author: Charles Dang <exodia339 at gmail.com>
  Date:   2017-03-03 (Fri, 03 Mar 2017)

  Changed paths:
    M src/units/frame.cpp

  Log Message:
  -----------
  Small fixup to 42f087abb

The old `tristate_to_bool` function returned the second argument if the value was `t_unset`. boost::tribool can be converted to bool,
but the intermediate state returns false. In this case, the only usecase of `tristate_to_bool` had true as a second argument, and I had
forgotten to explicitly check for the intermediate state when I switched to boost::tribool.

It might be useful to re-add the `tristate_to_bool` function again if conversions to bool become more common, but for now this simple
check works.