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fix: support null defaults in OptionParser #259

	name: Submodule Changes

	on:
	pull_request:
	types:
	- opened

	permissions:
	pull-requests: write
	contents: read

	jobs:
	changes:
	name: Submodule Changes
	if: github.actor == 'dependabot[bot]'
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v6
	with:
	fetch-depth: 0
	submodules: true
	- name: get changes
	id: changes
	run: \|
	for sm in $(grep 'path = ' .gitmodules \| awk '{print $3}'); do
	git diff origin/${{ github.base_ref }} --submodule=log -- $sm \| tee -a changes.txt
	done
	echo "changes<<EOF" >> $GITHUB_OUTPUT
	cat changes.txt >> $GITHUB_OUTPUT
	echo "EOF" >> $GITHUB_OUTPUT
	- name: comment
	uses: actions/github-script@v9
	with:
	script: \|
	github.rest.issues.createComment({
	issue_number: context.issue.number,
	owner: context.repo.owner,
	repo: context.repo.repo,
	body: `## Submodule Changes\n\n\`\`\`\n${{ steps.changes.outputs.changes }}\n\`\`\``
	})