no more omit

src/server/game.go

@@ -16,10 +16,10 @@ type Game struct {
 }
 
 type Player struct {
-	ID      string   `json:",omitempty"`
-	Name    string   `json:",omitempty"`
-	Card    string   `json:",omitempty"`
-	Balance Currency `json:",omitempty"`
+	ID      string
+	Name    string
+	Card    string
+	Balance Currency
 }
 
 type Currency int