Add notice to a list if it has no tasks

src/styles/components/list.scss

@@ -146,3 +146,9 @@
 .list-namespace-title {
   color: $grey;
 }
+
+.list-is-empty-notice {
+  text-align: center;
+  color: $grey;
+  font-style: italic;
+}

src/views/list/views/List.vue

@@ -77,6 +77,10 @@
 			</p>
 		</div>
 
+		<p v-if="tasks.length === 0" class="list-is-empty-notice">
+			This list is currently empty.
+		</p>
+
 		<div class="columns">
 			<div class="column">
 				<div class="tasks" v-if="tasks && tasks.length > 0" :class="{'short': isTaskEdit}">