fix(donations): Support anon donations in deletion modal

src/components/donations/DeleteDonationModal.svelte

@@ -13,6 +13,7 @@
       firstname: "",
       lastname: "",
     },
+    amount: 0,
   };
   const dispatch = createEventDispatcher();
   onMount(() => {
@@ -86,8 +87,10 @@
               </h3>
               <div class="w-full">
                 <span class="inline-block"
-                  ><b>{$_("donor")}</b>: {delete_donation.donor.firstname}
-                  {delete_donation.donor.lastname}</span
+                  >{#if delete_donation.donor}<b>{$_("donor")}</b>: {delete_donation.donor.firstname}
+                  {delete_donation.donor.lastname}{:else}{$_("anonymer_sponsor")}{/if}: {`${(delete_donation.amount / 100)
+          .toFixed(2)
+          .toLocaleString("de-DE", { valute: "EUR" })}€`}</span
                 >
               </div>
             </div>