fix(destination): empty oauth account check

[sanpj2292]

Description

The oauth account id can be empty. Due to the changes we might do as part of the regulation-worker support for Universal Analytics.

This check serves as protection when rudderAccountId is missing.

Background:

As part of the changes for supporting OAuth in regulation-worker module. We need to have one more field in destination config known as rudderUserDeleteAccountId which indicates that this account information will be used for sending delete user request to destination

This user delete feature can sometimes only require OAuth and event-delivery for the same destination might not need OAuth, int this case, we don’t populate rudderAccountId but we populate rudderUserDeleteAccountId with the access token information(which will be used for user-deletion requests)

This can cause a problem while processing the transformer proxy response for OAuth destinations. We would need to add a check to prevent any errors for such things.

Notion Ticket

https://www.notion.so/rudderstacks/Integrate-OAuth-in-regulation-worker-module-of-server-dae0cf6ef89e41eb91e9212ac524cf49

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Base: 45.43% // Head: 45.45% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (9e5628c) compared to base (ea8cf4c).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@                Coverage Diff                @@
##           release/1.3.x    #2675      +/-   ##
=================================================
+ Coverage          45.43%   45.45%   +0.02%     
=================================================
  Files                287      287              
  Lines              47777    47779       +2     
=================================================
+ Hits               21707    21720      +13     
+ Misses             24691    24683       -8     
+ Partials            1379     1376       -3     

Impacted Files	Coverage Δ
router/router.go	73.95% <0.00%> (+0.09%)	⬆️
config/backend-config/namespace_config.go	70.83% <0.00%> (-3.13%)	⬇️
processor/processor.go	86.40% <0.00%> (+0.41%)	⬆️
services/db/recovery.go	53.01% <0.00%> (+2.40%)	⬆️
router/manager/manager.go	100.00% <0.00%> (+3.29%)	⬆️

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