Backport of command: fixup parsing of stale query parameter into release/1.2.x #15654
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Backport
This PR is auto-generated from #15631 to be assessed for backporting due to the inclusion of the label backport/1.2.x.
WARNING automatic cherry-pick of commits failed. Commits will require human attention.
The below text is copied from the body of the original PR.
In #15605 we fixed the bug where the presense of "stale" query parameter
was mean to imply stale, even if the value of the parameter was "false"
or malformed. In parsing, we missed the case where the slice of values
would be nil which lead to a failing test case that was missed because
CI didn't run against the original PR. (#15632 for adding manual runs)