fix: don't emit a possible null task

src/components/tasks/add-task.vue

@@ -185,6 +185,10 @@ async function addTask() {
 		const taskRelationService = new TaskRelationService()
 		const relations = tasksToCreate.map(async t => {
 			const createdTask = createdTasks.find(ct => ct.title === t.title)
+			if (typeof createdTask === 'undefined') {
+				return
+			}
+
 			if (t.parent === null) {
 				emit('taskAdded', createdTask)
 				return