The following worked in scalar context without using keys to give list context. An empty hash gives 0 in scalar context. 
delete $hoh{Testcase}{comp}{cmd} unless %{$hoh{Testcase}{comp}{cmd}};
delete $hoh{Testcase}{comp} unless %{$hoh{Testcase}{comp}};

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In reply to Re^2: complete deletion from hash by inman
in thread complete deletion from hash by rsennat

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