delegation: minor fix around meta

token/delegation/delegation.go

@@ -79,10 +79,6 @@ func New(privKey crypto.PrivKey, aud did.DID, cmd command.Command, pol policy.Po
 		}
 	}
 
-	if len(tkn.meta.Keys) < 1 {
-		tkn.meta = nil
-	}
-
 	if err := tkn.validate(); err != nil {
 		return nil, err
 	}

token/delegation/ipld.go

@@ -229,5 +229,10 @@ func (t *Token) toIPLD(privKey crypto.PrivKey) (datamodel.Node, error) {
 		Exp:   exp,
 	}
 
+	// seems like it's a requirement to have a null meta if there are no values?
+	if len(model.Meta.Keys) == 0 {
+		model.Meta = nil
+	}
+
 	return envelope.ToIPLD(privKey, model)
 }