Ignore errors preparing user storage for existing users am: e667b604

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17416119



Change-Id: I708ff9144a64157b9e70fe2c338d4e809dbcb0f8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>