Finish task#3253 优化看板卡片弹出菜单的位置,cost:1 left:0

Finish task#3243 看板增加自定义设置显示颜色的功能,cost:3 left:0
Finish task#3242 看板增加默认展开/折叠任务选项卡的功能,cost:1 left:0
Finish task#3241 看板增加显示/隐藏已关闭已取消任务的功能,cost:2 left:0

module/task/model.php

@@ -1362,9 +1362,9 @@ class taskModel extends model
         foreach($tasks as $task)
         {
             $task = $this->processTask($task);
-            if($task->children) foreach($task->children as $child)
+            if(isset($task->children))
             {
-                $task = $this->processTask($child);
+                foreach($task->children as $child) $task = $this->processTask($child);
             }
         }
         return $tasks;