enhance(client): リアクションが無いことを伝える (#9901)

packages/frontend/src/components/MkReactedUsersDialog.vue

@@ -10,6 +10,11 @@
 
 	<MkSpacer :margin-min="20" :margin-max="28">
 		<div v-if="note" class="_gaps">
+			<div v-if="reactions.length === 0" class="_fullinfo">
+				<img src="https://xn--931a.moe/assets/info.jpg" class="_ghost"/>
+				<div>{{ i18n.ts.nothing }}</div>
+			</div>
+			<template v-else>
 				<div :class="$style.tabs">
 					<button v-for="reaction in reactions" :key="reaction" :class="[$style.tab, { [$style.tabActive]: tab === reaction }]" class="_button" @click="tab = reaction">
 						<MkReactionIcon :reaction="reaction"/>
@@ -19,6 +24,7 @@
 				<MkA v-for="user in users" :key="user.id" :to="userPage(user)">
 					<MkUserCardMini :user="user" :with-chart="false"/>
 				</MkA>
+			</template>
 		</div>
 		<div v-else>
 			<MkLoading/>