core: fix panic when AllocatedResources is nil

[schmichael]

Potential fix for #6540

[dekimsey]

I thought circleci had a way to grab the artifact, but I'm not seeing it anywhere obvious. Let me know where to grab it and I'll be happy to go test it.

[schmichael]

@dekimsey I feel like I used to be able to add binaries to GH issues/PRs, but now it's telling me the size limit is 10mb. Here's a Google Drive link that should work: https://drive.google.com/open?id=1tsZecFdcip3Glz4LC00DkyfHUT6RBuc1

[dekimsey]

Thanks @schmichael, lgfa29 gave me a link late yesterday. I tested it this morning and confirmed it addressed the crash. I reported this in the ticket earlier today. I'm sorry I didn't ping you!

[endocrimes]

LGTM, one comment about a comment.

A test would be nice for this, but it'd be fairly tricky to force I think so I won't block on it.

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