fix(1.0): invoke llm raise error

[hjlarry]

Summary

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when select a model of a tool, the completion_params will be None, will raise error:

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Checklist

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Please review the checklist below before submitting your pull request.

• 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

[Yeuoly]

A better solution is to avoid completion_params to be None in frontend I think, how do you think?

[hjlarry]

A better solution is to avoid completion_params to be None in frontend I think, how do you think?

That's correct, the changes have now been made on the frontend.

[Yeuoly]

LGTM