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3104 eliminate empty bpobjs Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Christopher Siden <chris.siden@delphix.com> Reviewed by: Garrett D'Amore <garrett@damore.org> Approved by: Eric Schrock <eric.schrock@delphix.com> References: illumos/illumos-gate@f174573681 illumos changeset: 13782:8f78aae28a63 https://www.illumos.org/issues/3104 Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>