[ISSUE #8950] Remove Redundant nullcheck of configPath

[jjastan]

Which Issue(s) This PR Fixes

Fixes #8950

Brief Description

Remove Redundant nullcheck

How Did You Test This Change?

No test.

[codecov-commenter]

Codecov Report

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

Project coverage is 47.67%. Comparing base (163451e) to head (1ab1ede).

Files with missing lines	Patch %	Lines
...e/rocketmq/container/BrokerContainerProcessor.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8951      +/-   ##
=============================================
- Coverage      47.68%   47.67%   -0.02%     
+ Complexity     11752    11746       -6     
=============================================
  Files           1303     1303              
  Lines          91041    91040       -1     
  Branches       11675    11674       -1     
=============================================
- Hits           43413    43399      -14     
- Misses         42267    42273       +6     
- Partials        5361     5368       +7     

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[qianye1001]

LGTM