Fix zero-operand gates and instructions (backport #8272) #9034
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* Fix zero-operand gates and instructions A few checks in different places didn't account for zero-operand gates being possible. In most uses, there never would be anything useful here, but it can occasionally be useful to create a "global-phase" instruction, especially if this is later going to have controls applied to it. This is well-formed within the Qiskit data model; spectator qubits implicitly undergo the identity, so this corresponds to the global phase being multiplied by the identity on _all_ qubits. * Fix controlled-gate qubit-number documentation * Add ScalarOp test * Be stricter about allowed num_ctrl_qubits Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> (cherry picked from commit bb93592)
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jakelishman
approved these changes
Oct 29, 2022
jakelishman
added
Changelog: Bugfix
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This is an automatic backport of pull request #8272 done by Mergify.
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