fix: Minor security schema fix

[vblagoje]

Why:

Enhances the OpenAPI client by ensuring it handles cases where security schemes are not specified, preventing potential issues with missing credentials.

What:

• Modified the credential handling logic to return a no-op function when security schemes are absent.
• Added integration test to verify API invocation handling with a real OpenAPI specification.

How can it be used:

The changes allow safer API client initialization in scenarios where security_schemes could be undefined:

if not self.credentials or not security_schemes:
    return lambda security_scheme, request: None  # No-op function

How did you test it:

Implemented an integration test that checks the client's functionality with an actual OpenAPI spec from GitHub's REST API. This includes invoking the API and validating responses.

Notes for the reviewer:

Pay attention to the logic change in get_authenticator to ensure no unintentional behaviors are introduced when security_schemes is not present. The new test depends on the availability of an API key in the environment to run.

[coveralls]

Pull Request Test Coverage Report for Build 13134513085

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 82.765%

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Totals
Change from base Build 13126115354:	0.0%
Covered Lines:	437
Relevant Lines:	528

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💛 - Coveralls