Return 404 instead of 500 when no contract is set

src/routes/[network]/(explorer)/contract/[contract]/+layout.ts

@@ -1,11 +1,20 @@
-import * as m from '$lib/paraglide/messages.js';
 import { Name, type ABI } from '@wharfkit/antelope';
+import { error } from '@sveltejs/kit';
+
+import * as m from '$lib/paraglide/messages.js';
 import type { LayoutLoad } from './$types';
 
 export const load: LayoutLoad = async ({ fetch, params, parent }) => {
 	const { network } = await parent();
 	const response = await fetch(`/${params.network}/api/contract/${params.contract}`);
 	const json = await response.json();
+
+	if (!response.ok || !json.abi.abi) {
+		return error(404, {
+			message: `No contract is currently deployed to the ${params.contract} account.`,
+			code: 'NOT_FOUND'
+		});
+	}
 	const abi: ABI = json.abi.abi;
 
 	return {