[ISSUE #8352] Fix CLIENT_REGISTER behavior in ConsumerManager#registerConsumer

[drpmma]

Which Issue(s) This PR Fixes

Fixes #8352

Brief Description

Fix CLIENT_REGISTER behavior in ConsumerManager#registerConsumer

How Did You Test This Change?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.81%. Comparing base (3aa5d19) to head (9ca11e9).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8353      +/-   ##
=============================================
- Coverage      43.85%   43.81%   -0.04%     
+ Complexity     10630    10624       -6     
=============================================
  Files           1274     1274              
  Lines          88940    88941       +1     
  Branches       11434    11435       +1     
=============================================
- Hits           39001    38972      -29     
- Misses         45011    45042      +31     
+ Partials        4928     4927       -1     

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