bpo-42562: Fix issue when dis failed to parse function that has no line numbers

[uriyyo]

https://bugs.python.org/issue42562

[markshannon]

#23636 will fix the missing line number.
dis shouldn't crash however, even if there is no line number.
Could you change the test to

def bug42562():
pass
bug42562.__code__ = bug42562.__code__.replace(co_linetable=b'\x04\x80\xff\x80')

to make the test robust against changes like #23636

[uriyyo]

@markshannon I have updated test.

Should I also revert show_lineno = bool(linestarts)?

[markshannon]

Needs a comment, otherwise LGTM.

[bedevere-bot]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

And if you don't make the requested changes, you will be poked with soft cushions!

[uriyyo]

I have made the requested changes; please review again

[bedevere-bot]

Thanks for making the requested changes!

@markshannon: please review the changes made to this pull request.

[uriyyo]

Should we update PR title and News?

[markshannon]

Should we update PR title and News?

Yes. Something like "has no line numbers" instead of "has only annotations"

[uriyyo]

I have updated PR title and News section.