fix(frontend): Fix input-field update on empty & default value

[majdyz]

There are three different issues:

• Deleting all text from input popup causes desync with input field on block #8626 where setting empty string from input box won't visually update the input field.
• https://github.com/Significant-Gravitas/AutoGPT/pull/8524/files#diff-69de95e19acaba021b2e4c08cada30293eb4d8bd451f93aa56cfecb91a5c5f97R235 seems to be a conflict resolving issue which causes the AgentExecutorBlock default value not being populated.
• Setting any nested input field will give a false-negative error UI (which makes the block red) due to the nested field being treated as a non-null error message.

Changes 🏗️

Fixed the mentioned issues above.

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:
  • ...

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.example 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

[codiumai-pr-agent-pro]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ 8626 - Fully compliant Compliant requirements: Fix implemented for empty string updates from input box to input field

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Edge Case The InputRef function modification to handle null values might need validation for edge cases with different falsy values Type Safety The hasNonNullNonObjectValue function accepts 'any' type which could lead to runtime errors with unexpected input types

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