Describe the bug

If you're using gh project item-edit to edit the title or body of a draft issue, --title without --body will clear the body, and --body without --title causes an error.

Affected version

gh version 2.68.1 (2025-03-06)

Steps to reproduce the behavior

1. Type gh project item-edit --project-id <PROJECT_ID> --id <DRAFT_ISSUE_ID> --body foobar
2. See error: "GraphQL: Title can't be blank (updateProjectV2DraftIssue)"

Expected vs actual behavior

It's expected that the two options should be usable independently, but that's not the actual behavior at the moment.