chore: fix code duplication, add error handling & improve checks

[0xkazak]

I've cleaned up some duplicated logic, added necessary checks, and handled edge cases more gracefully. Specifically:

• Removed duplicate code in the if and else blocks.
• Added checks to ensure cb and done_cb exist before calling them.
• Cleaned up error handling by removing unnecessary return values in catch blocks.
• Added a proper check for the presence of streamResponse.body to avoid potential issues with missing data.

These changes should make the code cleaner, safer, and more maintainable.

[netlify]

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