空目录清理任务针对非特殊仓库不进行删除，而只是清除用量信息

[zacYL]

What happened:

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• bk-repo version (use cat VERSION in installed dir):
• Cloud provider or hardware configuration:
• OS (e.g: cat /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others: