[ISSUE #7710] Handle blank string for UtilAll#split to fix the bugs of ACL #7712
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Which Issue(s) This PR Fixes
Fixes #7710
Brief Description
The PR is for a bug the ACL, which caused the problem of deleting the last item of the topic/group perms or the global white list.
The bug is due to the flaw of UtilAll#split func which didn't handle the blank string case properly.
So I've fixed it.
How Did You Test This Change?
This change have been tested by unit test and the bug have been tested on local.
I've also searched the usages of the changed method globally.
I'm sure the bug has been fixed and has no influence on any other functions of the project.