Qiskit / qiskit-terra / 5682797709

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Make circuit drawers *not crash* on `Expr` nodes (#10504)

* Make circuit drawers *not crash* on `Expr` nodes

This at least causes the circuit visualisers to not crash when
encountering an `Expr` node, and instead emit a warning and make a
best-effort attempt (except for LaTeX) to output _something_.  We intend
to extend the capabilities of these drawers in the future.

* Soften warnings about unsupported `Expr` nodes

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