Fix KeyError crash in add_pending_resources on malformed squeue output

[stephenacn]

Summary: Handle empty fields from squeue

Reviewed By: calebho, luccabb

Differential Revision: D105855425

[meta-codesync]

@stephenacn has exported this pull request. If you are a Meta employee, you can view the originating Diff in D105855425.

[luccabb]

Review automatically exported from Phabricator review in Meta.

[github-actions]

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