minor tweaks

src/ui/ErrorAlert.svelte

@@ -2,7 +2,7 @@
     import { onMount } from 'svelte';
     import { slide } from 'svelte/transition';
 
-    let extraClasses;
+    let extraClasses = "";
     export {extraClasses as class};
     export let slideDuration = 150;
     let animationClass = "";