qt: fix crash through stale pi resolve#10726
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When multiple PIs get resolved consecutively through repeated editing of the PI field, and the `on_resolve_done` callback tries to access a PI that has been cleared by a previous, failed callback an exception is raised. I was able to reproduce this somehow by adding a sleep to `PaymentIdentifier._do_resolve()` and entering lightning addresses. Fixes spesmilo#10724
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When multiple PIs get resolved consecutively through repeated editing of the PI field, and the
on_resolve_donecallback tries to access a PI that has been cleared by a previous, failed callback an exception is raised.I was able to reproduce this somehow by adding a sleep to
PaymentIdentifier._do_resolve()and entering lightning addresses.Fixes #10724