fix(client): Do not render img tag when icon url not provided

src/client/widgets/federation.vue

@@ -6,7 +6,7 @@
 		<mk-loading v-if="fetching"/>
 		<transition-group tag="div" name="chart" class="instances" v-else>
 			<div v-for="(instance, i) in instances" :key="instance.id" class="instance">
-				<img :src="instance.iconUrl" alt=""/>
+				<img v-if="instance.iconUrl" :src="instance.iconUrl" alt=""/>
 				<div class="body">
 					<a class="a" :href="'https://' + instance.host" target="_blank" :title="instance.host">{{ instance.host }}</a>
 					<p>{{ instance.softwareName || '?' }} {{ instance.softwareVersion }}</p>