fix(ceremony): add guard

ceremony/src/routes/contributions/[hash]/+page.svelte

@@ -1,62 +1,65 @@
 <script lang="ts">
-import { page } from "$app/stores"
-import { getUserContribution } from "$lib/supabase"
-import Spinner from "$lib/components/Spinner.svelte"
-import H2 from "$lib/components/typography/H2.svelte"
-import Button from "$lib/components/Button.svelte"
-import { toast } from "svelte-sonner"
+  import {page} from "$app/stores"
+  import {getUserContribution} from "$lib/supabase"
+  import Spinner from "$lib/components/Spinner.svelte"
+  import H2 from "$lib/components/typography/H2.svelte"
+  import Button from "$lib/components/Button.svelte"
+  import {toast} from "svelte-sonner"
 
-function hexToUint8Array(hexString: string) {
-  return new Uint8Array(hexString.match(/.{1,2}/g)?.map(byte => Number.parseInt(byte, 16)) || [])
-}
+  function hexToUint8Array(hexString: string) {
+    return new Uint8Array(hexString.match(/.{1,2}/g)?.map(byte => Number.parseInt(byte, 16)) || [])
+  }
 
-function uint8ArrayToUtf8(bytes: Uint8Array) {
-  return new TextDecoder().decode(bytes)
-}
+  function uint8ArrayToUtf8(bytes: Uint8Array) {
+    return new TextDecoder().decode(bytes)
+  }
 
-function decodeHexString(hexString: string) {
-  return uint8ArrayToUtf8(hexToUint8Array(hexString))
-}
+  function decodeHexString(hexString: string) {
+    return uint8ArrayToUtf8(hexToUint8Array(hexString))
+  }
 
-async function copyToClipboard(text: string, label: string) {
-  try {
-    await navigator.clipboard.writeText(text)
-    toast.success(`Copied ${label}!`)
-  } catch (err) {
-    console.error("Failed to copy text: ", err)
-    toast.error(`Failed to copy ${label} to clipboard.`)
+  async function copyToClipboard(text: string, label: string) {
+    try {
+      await navigator.clipboard.writeText(text)
+      toast.success(`Copied ${label}!`)
+    } catch (err) {
+      console.error("Failed to copy text: ", err)
+      toast.error(`Failed to copy ${label} to clipboard.`)
+    }
   }
-}
 </script>
 
-<div class="p-8">
-  {#await getUserContribution($page.params.hash)}
-    <Spinner class="size-5 text-union-accent-500"/>
-  {:then contribution}
-    {#if contribution}
-      <div class="flex flex-col items-start gap-1 px-3 py-2">
-        <div>
-          <H2>Contributor: <span class="!text-union-accent-500">{contribution.user_name}</span></H2>
-        </div>
-
-        <div class="flex flex-col gap-4">
+{#if $page.params.hash}
+  <div class="p-8">
+    {#await getUserContribution($page.params.hash)}
+      <Spinner class="size-5 text-union-accent-500"/>
+    {:then contribution}
+      {#if contribution}
+        <div class="flex flex-col items-start gap-1 px-3 py-2">
           <div>
-            <H2 class="mb-2">Public key</H2>
-            <pre class="text-white whitespace-pre-wrap bg-neutral-800 p-4 mb-4">{decodeHexString(contribution.public_key)}</pre>
-            <Button onclick={() => copyToClipboard(decodeHexString(contribution.public_key), "public key")}>Copy Public
-              key
-            </Button>
+            <H2>Contributor: <span class="!text-union-accent-500">{contribution.user_name}</span></H2>
           </div>
 
-          <div>
-            <H2 class="mb-2">Signature</H2>
-            <pre class="text-white whitespace-pre-wrap bg-neutral-800 p-4 mb-4">{decodeHexString(contribution.signature)}</pre>
-            <Button onclick={() => copyToClipboard(decodeHexString(contribution.signature), "signature")}>Copy
-              Signature
-            </Button>
+          <div class="flex flex-col gap-4">
+            <div>
+              <H2 class="mb-2">Public key</H2>
+              <pre class="text-white whitespace-pre-wrap bg-neutral-800 p-4 mb-4">{decodeHexString(contribution.public_key)}</pre>
+              <Button onclick={() => copyToClipboard(decodeHexString(contribution.public_key), "public key")}>Copy
+                Public
+                key
+              </Button>
+            </div>
+
+            <div>
+              <H2 class="mb-2">Signature</H2>
+              <pre class="text-white whitespace-pre-wrap bg-neutral-800 p-4 mb-4">{decodeHexString(contribution.signature)}</pre>
+              <Button onclick={() => copyToClipboard(decodeHexString(contribution.signature), "signature")}>Copy
+                Signature
+              </Button>
+            </div>
           </div>
         </div>
-      </div>
-    {/if}
-  {/await}
-</div>
+      {/if}
+    {/await}
+  </div>
+{/if}