[automerger skipped] Allow non-existing fstab.postinstall am: 4b28a53926 -s ours

am skip reason: Change-Id I8569d72c03a260bd1be9dcccb5b9ae670117179c with SHA-1 93cde30635 is in history

Change-Id: Icce17c2250017c0da619b225b9469da57947477a