Add pass to removed blocks of code

[vthemelis]

Solves #352 more generally.

We saw this in exception handlers but I think that it can manifest itself on any construct that has an expected child block.

We could potentially even totally remove the statements in the test as they are no-op.

[coveralls]

coverage: 97.819% (+0.009%) from 97.81% when pulling 945ddf4 on vthemelis:empty-excpetion-handler into 397ef7d on agronholm:master.

[agronholm]

You need to fix the linting error and add a note to the changelog. What's with the gitignore change?

[vthemelis]

You need to fix the linting error

Fixed

and add a note to the changelog.

Added

What's with the gitignore change?

I was getting a lot of .coverage.<blah> files when running tox locally. I can remove the change if you prefer but those files are not covered by any of the existing rules and I don't think that they should ever be committed to source control.

[agronholm]

The test you added seems to already pass in master.

EDIT: Never mind, I was on a 3.8 virtualenv so the test didn't get run.

[agronholm]

Thanks!

[vthemelis]

@agronholm, I opened python/cpython#108521 where they pointed out that maybe we should only be filling in body attributes of AST nodes. Would you like me to raise another PR to fix this?

[agronholm]

Sure.