Ignore bucket not found in getBucketInfos()

This may happen due to race condition (on bucket removal), or if the
system is interrupted halfway in bucket creation/removal.

Issue: ARSN-447

lib/storage/metadata/mongoclient/MongoClientInterface.js

@@ -2136,6 +2136,10 @@ class MongoClientInterface {
                 // in $regex
                 return this.getBucketAttributes(bucketName, log,
                     (err, bucketInfo) => {
+                        if (err?.is?.NoSuchBucket) {
+                            // Skip bucket if not found: can happen if bucket has just been removed
+                            return next();
+                        }
                         if (err) {
                             log.error('failed to get bucket attributes', {
                                 bucketName,