Correctly handle updating server data

server/update.go

@@ -3,6 +3,7 @@ package server
 import (
 	"encoding/json"
 	"github.com/buger/jsonparser"
+	"github.com/creasty/defaults"
 	"github.com/imdario/mergo"
 	"github.com/pkg/errors"
 	"go.uber.org/zap"
@@ -29,6 +30,11 @@ func (s *Server) UpdateDataStructure(data []byte) error {
 		return errors.New("attempting to merge a data stack with an invalid UUID")
 	}
 
+	// Set the default values in the interface that we unmarshaled into.
+	if err := defaults.Set(&src); err != nil {
+		return err
+	}
+
 	// Merge the new data object that we have received with the existing server data object
 	// and then save it to the disk so it is persistent.
 	if err := mergo.Merge(s, src, mergo.WithOverride); err != nil {