[Bug] Action fails on pull request close

[ThatOtherAndrew]

Issue

If a pull request is closed without merging, the action fails with an error at the Parse content metadata step.

Example

jq: error (at organization-Breadcord-issue-PR_kwDOItt-hs5Gk46V.json:0): Cannot iterate over null (null)

Full debug log from running this job in a repository: debug.log

The relevant code from the workflow file:

on:
  issues:
    types: [ closed ]
  pull_request:
    types: [ closed ]

  if_closed:
    name: Mark as Closed
    if: ${{ github.event.issue.state_reason == 'not_planned' || (github.event_name == 'pull_request' && !github.event.pull_request.merged) }}
    runs-on: ubuntu-latest
    steps:
      - uses: Breadcord/update-project-action@main
        with:
          github_token: ${{ secrets.ACTIONS_TOKEN }}
          organization: Breadcord
          project_number: 1
          content_id: ${{ github.event.issue.node_id || github.event.pull_request.node_id }}
          field: Status
          value: Closed

Note that Breadcord/update-project-action is a clone of this action, but with PRs #8 and #10 merged in.