fix: modified return of nil response for HTTP Connection Error

[ChinmayaSharma-hue]

Related Issue

When port is changed in the test case after keploy record is run, the keploy test produces a report which shows that the status is Running instead of Failed.

Closes: #1169

Describe the changes you've made

• A small code change in pkg/util.go to handle cases where the returned HTTP response is null, to return a valid models.HttpResp to make sure that this case can be accurately classified as Failed in pkg/service/test/test.go when compared with the actual response that needed to be returned.
• A condition addition in an if block in pkg/service/test/test.go to check if response is nil before doing an early return without running testHttp.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Please let us know if any test cases are added

NA

Describe if there is any unusual behaviour of your code(Write NA if there isn't)

NA

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

Screenshots (if any)

NA

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[ChinmayaSharma-hue]

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