fix: translate empty versionID string to null version where appropriate (#11629)

We store the null version as empty string. We should translate it to null
version for bucket with version suspended too.

cmd/erasure-metadata.go

@@ -102,7 +102,7 @@ func (fi FileInfo) IsValid() bool {
 func (fi FileInfo) ToObjectInfo(bucket, object string) ObjectInfo {
 	object = decodeDirObject(object)
 	versionID := fi.VersionID
-	if globalBucketVersioningSys.Enabled(bucket) && versionID == "" {
+	if (globalBucketVersioningSys.Enabled(bucket) || globalBucketVersioningSys.Suspended(bucket)) && versionID == "" {
 		versionID = nullVersionID
 	}