优化

app/src/main/java/io/legado/app/help/BookSourceAnalyzer.kt

@@ -156,10 +156,10 @@ object BookSourceAnalyzer {
         var customOrder: Int = 0,                       // 手动排序编号
         var enabled: Boolean = true,                    // 是否启用
         var enabledExplore: Boolean = true,             // 启用发现
-        var concurrentRate: String?,
+        var concurrentRate: String? = null,             // 并发率
         var header: String? = null,                     // 请求头
         var loginUrl: Any? = null,                      // 登录规则
-        var loginUi: List<RowUi>? = null,             //登录UI
+        var loginUi: List<RowUi>? = null,               // 登录UI
         var loginCheckJs: String? = null,               //登录检测js
         var bookSourceComment: String? = "",            //书源注释
         var lastUpdateTime: Long = 0,                   // 最后更新时间，用于排序