chroot_version_hooks.d: ignore pypy3 unmerge failures

If the package isn't installed, there's nothing to do.

BUG=b:207726852
TEST=CQ passes

Change-Id: Iaf62d1878f8e2bbef3b412e345a23709f2adf4f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/3301402
Tested-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Fei Shao <fshao@chromium.org>
Reviewed-by: Fei Shao <fshao@chromium.org>
Reviewed-by: Grant Grundler <grundler@chromium.org>
1 file changed