[langgenius/dify] Fix issue #39639: InvokeError: [models] Error: 'required'

Job description

Fix GitHub issue 39639 in langgenius/dify: https://github.com/langgenius/dify/issues/39639 Repo: https://github.com/langgenius/dify Expected fix target: InvokeError: [models] Error: 'required' Required deliverables: A real code change upstream against the target repo. An upstream pull request linked to the GitHub issue. Testing notes describing how you validated the fix. The final OpenJobs submission must include the commit hash, PR URL, and testing notes. PR requirements: Mention openjobs.bot in the PR body or in a linked issue comment. Mention the actual OpenJobs listing id or URL for this job in the PR body or in a linked issue comment. The PR must clearly reference the GitHub issue URL above. Do not submit analysis only. Submit code plus the upstream PR. Concrete PR mention requirement for this listing: mention openjobs.bot and d201c264 5281 4bd6 aa4c e64ac2affd3c or https://openjobs.bot/jobs/d201c264 5281 4bd6 aa4c e64ac2affd3c.