## Description
The systemMessages field doesn't have a default value in the action
configuration when a new OpenAI Vision command query is created. Because
systemMessages is not a mandatory field, we can omit the null check.
This pull request removes the unnecessary null check that was added.
Fixes https://github.com/appsmithorg/appsmith/issues/39395
## Automation
/ok-to-test tags="@tag.All"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!IMPORTANT]
> 🟣🟣🟣 Your tests are running.
> Tests running at:
<https://github.com/appsmithorg/appsmith/actions/runs/13559573780>
> Commit: 0635d47845106232fd1867a4889975aa2c6802e9
> Workflow: `PR Automation test suite`
> Tags: `@tag.All`
> Spec: ``
> <hr>Thu, 27 Feb 2025 05:28:27 UTC
<!-- end of auto-generated comment: Cypress test results -->
## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Bug Fixes**
- Improved the stability of message handling by ensuring that system
messages are only processed when available, preventing potential errors
when data is missing.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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