## Description
> [!TIP]
> _Add a TL;DR when the description is longer than 500 words or
extremely technical (helps the content, marketing, and DevRel team)._
>
> _Please also include relevant motivation and context. List any
dependencies that are required for this change. Add links to Notion,
Figma or any other documents that might be relevant to the PR._
Fixes#38767
> [!WARNING]
> _If no issue exists, please create an issue first, and check with the
maintainers if the issue is valid._
## Automation
/ok-to-test tags="@tag.Git, @tag.ImportExport"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!TIP]
> 🟢🟢🟢 All cypress tests have passed! 🎉🎉🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/12912937730>
> Commit: 0e9f7c2b12a4dc384ceedce1492170cd965fa13a
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=12912937730&attempt=2"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Git, @tag.ImportExport`
> Spec:
> <hr>Wed, 22 Jan 2025 18:43:17 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
- **Theme Management**
- Simplified theme import and publishing logic
- Removed handling of published mode themes during import process
- Updated theme management to handle scenarios with null theme IDs
- **Bug Fixes**
- Improved null handling for application and theme-related lists
- Ensured proper initialization of page and theme lists to prevent
potential exceptions
- **Testing**
- Updated test assertions to reflect new theme management approach
- Adjusted expectations for published mode theme ID during application
imports
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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