Continue to call finalizers in the stack when a finalizer raises an exception

[sangongs]

Issue #3569

[nicoddemus]

Thanks a lot @sangongs for the PR, we really appreciate it.

Your initial PR failed because it failed during linting, more specifically black (check step 3 of the long version in the contributing guide). I took the liberty of fixing it myself and pushing to your branch. 👍

Once again thanks for the PR!

[coveralls]

Coverage increased (+0.06%) to 92.726% when pulling 4112596 on sangongs:fix_stack_finalizer into 04b65cf on pytest-dev:master.