Fix: Fail to render if parent was deleted

src/scripts/js/es6/common/vuecomponents/taskstable/rows/TaskRow.js

@@ -4,7 +4,7 @@ class TaskRow extends AttractRowBase {
     constructor(task) {
         super(task);
         this.parent = undefined;
-        if (typeof task.parent === 'object') {
+        if (task.parent && task.parent._id) {
             // Deattach parent from task to avoid parent to be overwritten when task is updated
             let parentId = task.parent._id;
             this.parent = task.parent;