Qiskit job result missing attributes cause wrong exception when job fails in VQE

azure/quantum/qiskit/job.py の、issue で参照されている result_dict の構築箇所から始め、その出力を Qiskit Result の期待される内容と比較します。失敗した VQE ジョブのシナリオを再現し、その後、成功したジョブに影響を与えることなく、結果として得られるエラー情報が期待される結果属性から利用できることを確認します。

If running the VQE sample and it fails to run on a quantum_instance (for instance, if Quantinuum is out of credits), then instead of printing the error code and message, it prints that an attribute "status" could not be found.

It looks like this is throwing from when it tries to read result.status from run_circuits.py.

Looking at the latest definition of Result object in qiskit, it looks like for the error_data message to be shown, we should encode the error_data into status field as well.

This is where we encode job result into Qiskit result as part of azure-quantum: https://github.com/microsoft/qdk-python/blob/944fac0ee64e962b65b73f29635a2c65abf332d7/azure-quantum/azure/quantum/qiskit/job.py#L93

Current:

result_dict = {
            "results" : [results],
            "job_id" : self._azure_job.details.id,
            "backend_name" : self._backend.name(),
            "backend_version" : self._backend.version,
            "qobj_id" : self._azure_job.details.name,
            "success" : success,
            "error_data" : None if self._azure_job.details.error_data is None else self._azure_job.details.error_data.as_dict()
}

Proposed change:

error_msg = None if self._azure_job.details.error_data is None else self._azure_job.details.error_data.as_dict()
result_dict = {
            "results" : [results],
            "job_id" : self._azure_job.details.id,
            "backend_name" : self._backend.name(),
            "backend_version" : self._backend.version,
            "qobj_id" : self._azure_job.details.name,
            "success" : success,
            "error_data" : error_msg,
            "status": error_msg,
}

We may optionally want to add the other missing attributes on Qiskit result that are currently not populated, such as date, header, in case they also cause errors down the road.