Fix bad sad error occurred with incorrect central token

[Thevakumar-Luheerathan]

Purpose

Describe the problems, issues, or needs driving this feature/fix and include links to related issues.

Fixes #41785

Approach

Describe how you are implementing the solutions along with the design details.

Samples

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Remarks

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Check List

• Read the Contributing Guide
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[codecov]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (0823dc9) 0.00% compared to head (98bed87) 76.70%.
Report is 36 commits behind head on master.

Files	Patch %	Lines
...ballerinalang/central/client/CentralAPIClient.java	25.00%	12 Missing ⚠️
.../main/java/org/ballerinalang/docgen/Generator.java	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #42152       +/-   ##
=============================================
+ Coverage      0.00%   76.70%   +76.70%     
- Complexity        0    53052    +53052     
=============================================
  Files             9     2883     +2874     
  Lines            35   199976   +199941     
  Branches          0    26031    +26031     
=============================================
+ Hits              0   153389   +153389     
- Misses           35    38134    +38099     
- Partials          0     8453     +8453     

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