Exceptions when loading stats

[JumanaFM]

The following expections are thrown when loading the stats, can you please review this. @alizeeschoen

This is the cause of the issue

nb/src/components/course/CourseContents.vue

Lines 94 to 97 in 51a981c

	<div class="annotations"> Mine: {{annotations.filter(a => a.filepath === props.row.Source.filepath)[0]["me"]}} </div>
	<div class="annotations"> Unread: {{annotations.filter(a => a.filepath === props.row.Source.filepath)[0]["unread"]}} </div>
	<div class="annotations"> Reply Requests: {{annotations.filter(a => a.filepath === props.row.Source.filepath)[0]["replyRequests"]}} </div>
	<div class="annotations"> Total: {{annotations.filter(a => a.filepath === props.row.Source.filepath)[0]["total"]}} </div>