The v2 catalog API needs to filter out the empty repository and the repository which artifacts are all with no tags.
1,In v2.0.0, Harbor does not delete repository even there is no artifact, it's different with v1.10.0
2, Compares with docker distribution, it doesn't return the respository with untagged images.
Signed-off-by: wang yan <wangyan@vmware.com>