bsdinstall: don't fail if fstab is empty
PR: 210865
Submitted by: Tim Lukasiewicz <eclipzetech08@gmail.com>, h-fujishima@sakura.ad.jp (original version)
Reported by: h-fujishima@sakura.ad.jp
Reviewed by: sef
MFC after: 2 weeks
Sponsored by: Klara Inc.
Event: July 2020 Bugathon
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head/usr.sbin/bsdinstall/scripts/umount