CreateRoleParams displayName is optional but throws NPE #10486

[alansemenov]

Made behaviour in createUser and createRole consistent with createGroup: use name when displayName is omitted

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 84.51%. Comparing base (c80742c) to head (02de453).

Files	Patch %	Lines
...java/com/enonic/xp/lib/auth/CreateRoleHandler.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #10496      +/-   ##
============================================
- Coverage     84.52%   84.51%   -0.01%     
- Complexity    19680    19682       +2     
============================================
  Files          2613     2613              
  Lines         68385    68388       +3     
  Branches       5460     5462       +2     
============================================
+ Hits          57799    57801       +2     
  Misses         7948     7948              
- Partials       2638     2639       +1     

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