fix: Prevent failure if no files need to be deleted find | xargs rm

[ypid-geberit]

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[ebeahan]

The Makefile rule that uses this command is going away in an upcoming version - see #1567.

However, we could still apply this fix to past/current 1.x branches.

[ypid-geberit]

In that case, do as you see fit.

[ebeahan]

Cherry-picked this change to target 1.12 in #1588