fix: fix genericOpenAi null exception(#3273)

[qigaode]

Pull Request Type

• [ ] ✨ feat
• [x] 🐛 fix
• [ ] ♻️ refactor
• [ ] 💄 style
• [ ] 🔨 chore
• [ ] 📝 docs

Relevant Issues

resolves #3273

What is in this change?

fix null exception LLM processing failed: Cannot read properties of null (reading 'length') TypeError: Cannot read properties of null (reading 'length')

Additional Information

Developer Validations

• [x] I ran yarn lint from the root of the repo & committed changes
• [x] Relevant documentation has been updated
• [x] I have tested my code functionality
• [x] Docker build succeeds locally