Set error levels to default when no backend is selected #772
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Summary
As @merav-aharoni mentioned in #748 (comment), if
self._session.backend()
does not exist, the optimization and resilience levels will be set toNone
which would fail the job.This could happen on cloud when no backend is selected, or when the sampler/estimator are used as sessions
tests should be covered in #748
Details and comments
Fixes #