Handle Null Pointer Exception while trying to delete already deleted Authorized API

[kumardeepak5]

Purpose

This PR may resolve wso2/product-is#21260

Goals

This PR addresses a NullPointerException that occurs when attempting to delete an already deleted Authorized API.

Behavior After Fix:

Below are the Sample Request & response.
Request [Delete already deleted Authorized API]

curl --location --request DELETE 'https://localhost:9443/api/server/v1/applications/<applcation-id>/authorized-apis/<api-id>' \
--header 'Authorization: Basic <username:password>'

Response [Delete already deleted Authorized API]
Response Code - 204
Empty Response Body

[CLAassistant]

All committers have signed the CLA.

[HasiniSama]

Suggestion: Could we consider changing this to

if (authorizedAPI == null || authorizedAPI.getScopes() == null) { instead?

This approach is more commonly used in the codebase and may be slightly more readable.

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/11663312625

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 54.81%. Comparing base (afd5acb) to head (be3c0bb).
Report is 51 commits behind head on master.

Files with missing lines	Patch %	Lines
...tity/oauth/listener/IdentityOauthEventHandler.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2607      +/-   ##
============================================
- Coverage     56.23%   54.81%   -1.43%     
- Complexity     8128     8632     +504     
============================================
  Files           632      632              
  Lines         46158    49534    +3376     
  Branches       7771     8724     +953     
============================================
+ Hits          25956    27150    +1194     
- Misses        16478    18490    +2012     
- Partials       3724     3894     +170     

Flag	Coverage Δ
unit	38.69% <0.00%> (-0.01%)	⬇️

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[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/11663312625
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/11663312625