Account for soft-deleted subjects (#1127)

[PatrickTu]

PR to fix issue #1127

[ghost]

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[PatrickTu]

[clabot:check]

[ghost]

@confluentinc It looks like @PatrickTu just signed our Contributor License Agreement. 👍

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[PatrickTu]

Ready to be reviewed @edenhill @mhowlett

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
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[rayokota]

Subsumed by #1867