feat(blocks): Improve XML parsing error handling with specific AttributeError message

[seer-by-sentry[bot]]

Fixes AUTOGPT-SERVER-6GY. The issue was that: GravitasML parser bug: List object lacks add_text method when processing text content, causing AttributeError.

Changes 🏗️

• Adds a specific error message for AttributeError during XML parsing, indicating potential incompatibility with certain XML formats that create List objects with text content when using the gravitasml library.
• This provides more informative error messages to users when encountering XML parsing issues.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 2040383

Not quite right? Click here to continue debugging with Seer.

Checklist 📋

For code changes:

• [ ] I have clearly listed my changes in the PR description
• [ ] I have made a test plan
• [ ] I have tested my changes according to the test plan:
  • [ ] Add a test case that triggers the AttributeError during XML parsing with a List object containing text content.
  • [ ] Verify that the new error message is displayed when the AttributeError occurs.
  • [ ] Ensure that the application handles the error gracefully without crashing.

Example test plan

• [ ] Create from scratch and execute an agent with at least 3 blocks
• [ ] Import an agent from file upload, and confirm it executes correctly
• [ ] Upload agent to marketplace
• [ ] Import an agent from marketplace and confirm it executes correctly
• [ ] Edit an agent from monitor, and confirm it executes correctly

For configuration changes:

• [ ] .env.default is updated or already compatible with my changes
• [ ] docker-compose.yml is updated or already compatible with my changes
• [ ] I have included a list of my configuration changes in the PR description (under Changes)

Examples of configuration changes

• Changing ports
• Adding new services that need to communicate with each other
• Secrets or environment variable changes
• New or infrastructure changes such as databases

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Here's the code health analysis summary for commits 3f546ae..42904c6. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success		View Check ↗
Python	✅ Success		View Check ↗

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[AutoGPT-Agent]

Thank you for this PR that improves error handling in the XML parser. The code change looks good and addresses the Sentry issue appropriately.

Before this can be merged, please:

1. Complete the checklist in the PR description by checking off the items you've completed. Currently, none of the checkboxes are marked as complete.

Specifically, please mark:

• [x] I have clearly listed my changes in the PR description
• [x] I have made a test plan
• [x] I have tested my changes according to the test plan

Once you've checked off these items, the PR will be ready for another review.