If warnings come from recipes parsing
and not from package build, 'parent' object
will be None; so don't update the color for it.
[YOCTO #5621]
(Bitbake rev: f9d24f55a5ffa9257e7ba3257be1210687513733)
Signed-off-by: Valentin Popa <valentin.popa@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>