Qiskit / qiskit / 6911016807

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Commit Message

Fix issue with ScheduleBlock qpy serialization and use_symengine (#11261)

* Fix issue with ScheduleBlock qpy serialization and use_symengine

This commit fixes an issue with the use_symengine flag on the qpy.dump()
function. Previously in certain conditions a symengine expression that
was listed in the qpy header as being encoded via symengine was
incorrectly being serialized using sympy. This would cause a failure on
deserialialization as the qpy payload was invalid and symengine could
not parse a symengine representation.

This was originally caught during the development of #10902 as that
switches the default of use_symengine to ``True`` as it makes symengine
a hard requirement. This commit splits it out so the isolated fix can be
backported to 0.45.1.

* Skip symengine test if symengine isn't installed

* Fix skip syntax

* Update releasenotes/notes/fix-schedule-qpy-use-symengine-05ae1dfab73e3ff8.yaml

Co-authored-by: Jake Lishman <jake@binhbar.com>

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Co-authored-by: Jake Lishman <jake@binhbar.com>

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