fix(async-io): return coro when __name__ is not present

[povilasv]

Description

Fixes #2340

Seems to be we need to return coro when name is not present as per #2521 (comment)

Though demo app and unit test works in both cases 🤔

I guess it's still better for consistency

Type of change

Please delete options that are not relevant.

• 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)
• This change requires a documentation update

How Has This Been Tested?

Running:

Installing dev dependency and running:
python3 anext.py

from the issue - #2340

• Test A

Does This PR Require a Core Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

See contributing.md for styleguide, changelog guidelines, and more.

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[xrmx]

Thanks!