fix(1.0): unexpected error raise

[hjlarry]

Summary

Tip

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First

This will raise None type has no attribute 'get'

Second

the expected Tool with name not found error will not raised

Screenshots

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Checklist

Important

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• 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

[yihong0618]

nice catch