update null check in provider config for bedrock

[narengogi]

Author Description

Tested with existing providers on bedrock and newer ones

Title: update null check in provider config for bedrock

🔄 What Changed

• Fixed potential null reference errors in Bedrock provider configuration
• Updated how response transforms are assigned to properly handle undefined objects
• Implemented proper object spreading to preserve existing configuration

🔍 Impact of the Change

• Prevents runtime errors when accessing properties on undefined objects
• Makes the code more robust and resilient
• Maintains backward compatibility with existing implementations

📁 Total Files Changed

• 1 file modified (src/providers/bedrock/index.ts)
• 8 lines added, 4 lines removed

🧪 Test Added

• Manually tested with existing providers on bedrock and newer ones

🔒 Security Vulnerabilities

• N/A

• Code follows project style guidelines

• Changes are well documented

• Appropriate error handling is implemented

• No new security vulnerabilities introduced

Quality Recommendations

1. Consider adding unit tests to verify the null check behavior

2. Add more detailed comments explaining why this change was necessary