Privacy: Hide views that have a count of 0 on privacy request tables, for...

Privacy: Hide views that have a count of 0 on privacy request tables, for consistency with other list tables.

Props pbiron, garrett-eclipse, mapk, melchoyce, estelaris.
Fixes #47495.
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git-svn-id: https://core.svn.wordpress.org/trunk@48053 1a063a9b-81f0-0310-95a4-ce76da25c4cd