Handle the case of no grid options available am: 433e13b4 am: b48ad8d2

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/21778919



Change-Id: I30c86fce05f28fea31c100365034405132b7525a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>