- Fixed bug in :class:`.Connection` and pool where the

- Fixed bug in :class:`.Connection` and pool where the
:meth:`.Connection.invalidate` method, or an invalidation due
to a database disconnect, would fail if the
``isolation_level`` parameter had been used with
:meth:`.Connection.execution_options`; the "finalizer" that resets
the isolation level would be called on the no longer opened connection.
fixes #3302

(cherry picked from commit 068f9a1531c8114360d5fcd964c27fe6a21f4679)