fix(connector): [Paypal]fix error deserelization for source verification call

[srujanchikke]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

fix error deserelization for source verification call . Make description in error response as optional field as it is not expected incase of webhook source verification call

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

fix error deserelization for source verification call . Make description in error response as optional field as it is not expected incase of webhook source verification call

How did you test it?

1)error deserilization success scenario ,
Source verifcation is failure as secret is not set in merchant connector account ,By default we provide secret as default_string. when we include _ in webhook secret paypal throws error as follow
"name": "INVALID_REQUEST", "message": "Request is not well-formed, syntactically incorrect, or violates schema.", "debug_id": "c2a4be266f6d6", "details": [ { "field": "/webhook_id", "value": "sruj*an", "location": "body", "issue": "must match \"^[a-zA-Z0-9]+$\"" } ],

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible
• I added a CHANGELOG entry if applicable

[ArjunKarthik]

Suggested change

	let reason = match error_reason {
	Some(err_reason) => err_reason
	.is_empty()
	.then(|| response.message.to_owned())
	.or(Some(err_reason)),
	None => Some(response.message.to_owned()),
	};
	let reason = error_reason
	.unwrap_or(response.message.to_owned())
	.is_empty()
	.then_some(response.message.to_owned());