blobSize 方法空指針異常

[seamounts]

鏡像轉換完成push之後，出現報錯：
panic: runtime error: invalid memory address or nil pointer dereference

// bolbSize return the content blob size in a bucket
func blobSize(bucket *bolt.Bucket) (int64, error) {
	size, bytesRead := binary.Varint(bucket.Get(bucketKeySize))
	if bytesRead <= 0 {
		return 0, fmt.Errorf("read size from database")
	}
	return size, nil
}

...
Oct 30 15:31:43 gpu001 acceld[1331288]:         go.etcd.io/bbolt.(*Bucket).Cursor(0x0)
Oct 30 15:31:43 gpu001 acceld[1331288]:                 /home/runner/go/pkg/mod/go.etcd.io/bbolt@v1.3.11/bucket.go:84 +0x25
Oct 30 15:31:43 gpu001 acceld[1331288]:         go.etcd.io/bbolt.(*Bucket).Get(0x0, {0x2539990, 0x4, 0x4})
Oct 30 15:31:43 gpu001 acceld[1331288]:                 /home/runner/go/pkg/mod/go.etcd.io/bbolt@v1.3.11/bucket.go:263 +0x56
Oct 30 15:31:43 gpu001 acceld[1331288]:         github.com/goharbor/acceleration-service/pkg/content.blobSize(0x0)
Oct 30 15:31:43 gpu001 acceld[1331288]:                 /home/runner/work/acceleration-service/acceleration-service/pkg/content/bucket.go:65 +0x53
Oct 30 15:31:43 gpu001 acceld[1331288]:         github.com/goharbor/acceleration-service/pkg/content.(*Content).cleanLeases.func1(0xc0006f02a0)
Oct 30 15:31:43 gpu001 acceld[1331288]:                 /home/runner/work/acceleration-service/acceleration-service/pkg/content/content.go:185 +0xd4
Oct 30 15:31:43 gpu001 acceld[1331288]:         go.etcd.io/bbolt.(*DB).View(0xc0002fcd88, 0xc002c16600)
Oct 30 15:31:43 gpu001 acceld[1331288]:                 /home/runner/go/pkg/mod/go.etcd.io/bbolt@v1.3.11/db.go:917 +0x167
...

containerd 版本 v1.7.15
acceleration-service 版本：v0.2.24

[imeoer]

Thanks for the report, a fixup PR here: #360

[imeoer]

@seamounts Should have been fixed in v0.2.25.