CrOS: Check for selected_view_ before moving apps in the app grid.

Fixes a crash when doing control->arrow when a suggested chip is
focused.

Bug: 956163
Change-Id: I4e2970e38078b52331a52802fd1b12f1ac2bd96b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1582768
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Kevin Strohbehn <ginko@google.com>
Auto-Submit: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654282}
2 files changed