Handle token null scenario when retrieving the token hash from the issuer

[madurangasiriwardena]

Related to the fix in #2732

[codecov]

Codecov Report

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

Project coverage is 56.90%. Comparing base (1eeffb6) to head (9c056d6).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
...penidconnect/DefaultOIDCClaimsCallbackHandler.java	0.00%	0 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #2733   +/-   ##
=========================================
  Coverage     56.90%   56.90%           
- Complexity     8566     8567    +1     
=========================================
  Files           654      654           
  Lines         48425    48425           
  Branches      10252    10252           
=========================================
+ Hits          27556    27557    +1     
  Misses        16967    16967           
+ Partials       3902     3901    -1     

Flag	Coverage Δ
unit	39.98% <0.00%> (+<0.01%)	⬆️

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[Thumimku]

The flow was working for code grant but not working for password grant. I tested the flow with the fix and its working .