✅ make sure master object to parse it

Issue: CLDSRV-632

Author: DarkIsDude

lib/routes/routeBackbeat.js

@@ -661,6 +661,11 @@ function putMetadata(request, response, bucketInfo, objMd, log, callback) {
                 if (versioning && !objMd) {
                     const masterObjectAndBucket =
                         await metadata.getBucketAndObjectMDPromised(bucketName, objectKey, {}, log);
+
+                    if (!masterObjectAndBucket.obj) {
+                        return;
+                    }
+
                     const masterObject = JSON.parse(masterObjectAndBucket.obj);
                     await versioningPreprocessingPromised(bucketName, bucketInfo, objectKey, masterObject, log);
                 }