don't assume 'extras_require' is present in pkginfo dict

[wimglenn]

closes #4354

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[beeankha]

Hi @wimglenn , could you please rebase this PR against the current master branch so that all CI tests (which are now in GitHub Actions) can run as they currently are? Also, did you sign the Conda Contributor License Agreement?

[wimglenn]

@beeankha I have rebased against master. Yes I signed the CLA nine days ago, but the bots don't seem to have noticed..

[beeankha]

@anaconda-issue-bot check

[beeankha]

Hi @wimglenn , it looks like the CI tests are relying on the changes that are happening in this PR before they can run properly here. Sorry for the delay, we're actively working on those tests currently and I'll let you know as soon as it's time to rebase again!

[jezdez]

I've left a larger comment in #4412 (comment) that I think may point to a bigger problem with the way package data is retrieved.

[wimglenn]

Closing in favor of #4434