fix: does not save segment vector when there is no attachment_ids

[Chenyl-Sai]

1. Fix code indentation issue
2. Fix keywords missing cause segment vector save failed issue

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Summary

fix #29547
fix #29604

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @Chenyl-Sai, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the reliability of segment vector creation within the dataset service. It resolves an indentation issue that could have led to incorrect execution flow for vector index saving and implements a check to prevent errors when keyword data is not supplied, thereby improving the overall stability and error handling of the segment creation process.

Highlights

• Indentation Correction: The code responsible for saving segment vectors has been re-indented to ensure it executes correctly, regardless of the presence of attachment IDs.
• Robust Keyword Handling: The logic for creating segment vectors now safely handles cases where 'keywords' are not provided in the input arguments, preventing failures and ensuring the process completes.

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[gemini-code-assist]

Code Review

This pull request addresses two issues: it ensures that segment vectors are saved even when there are no attachment IDs by correcting an indentation issue, and it prevents a KeyError when creating a segment without keywords. The logic changes appear correct and align with the pull request's objectives. I've provided one suggestion to improve the code's readability and follow Python best practices for dictionary access.