fix incorrect exception raised by api tool which leads to incorrect L…

[lancemao]

fix incorrect exception raised by api tool which leads to incorrect LLM response

Description

The current code always raise ToolProviderCredentialValidationError exception event though credential is correct

Fixes # (issue)

Type of Change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update, included: Dify Document

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• TODO

Suggested Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods
• optional I have made corresponding changes to the documentation
• optional I have added tests that prove my fix is effective or that my feature works
• optional New and existing unit tests pass locally with my changes

[Yeuoly]

Hello, thanks for your contributions, it's a pretty good job to make sure API tool can raise correct Exceptions, but it seems that there is a CI error we should take a look at.

[bowenliang123]

Nice, what a long-awaited fix to me.

Please run dev/reformat to autofix and make sure your Python code passes the style check.