[ISSUE #7662] fix: updateAccessConfig when groupPerms is empty

[javens0601]

Which Issue(s) This PR Fixes

Fixes #7662

Brief Description

org.apache.rocketmq.common.UtilAll#join return "" when list is empty, When I updateAccessConfig, the method UtilAll.split(requestHeader.getGroupPerms(), ",") Returns a collection of empty strings. The method org.apache.rocketmq.acl.common.Permission#checkResourcePerms will not running well.

How Did You Test This Change?

yes, I updateAccessConfig successfully.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (6fce427) 43.21% compared to head (9c2e9f8) 43.18%. Report is 9 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #7664      +/-   ##
=============================================
- Coverage      43.21%   43.18%   -0.04%     
- Complexity      9815     9818       +3     
=============================================
  Files           1165     1165              
  Lines          84548    84548              
  Branches       10980    10980              
=============================================
- Hits           36534    36508      -26     
- Misses         43472    43501      +29     
+ Partials        4542     4539       -3     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.