call self._process_futures on canceled futures when BlockingRunner is done

[basnijholt]

Description

call self._process_futures on canceled futures when BlockingRunner is done.

thanks @jgukelberger for noticing this

Fixes #319

Checklist

• Fixed style issues using pre-commit run --all (first install using pip install pre-commit)
• pytest passed

Type of change

Check relevant option(s).

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• (Code) style fix or documentation update
• This change requires a documentation update

[basnijholt]

It appears that in our tests, the futures of a BlockingRunner do get canceled as expected. So I added a check to filter out the futures that are done.