added another state check

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/routes/document/Add.svelte

@@ -6,7 +6,7 @@
 
     let router = useTinyRouter();
     let company = $state(null);
-    let error = null;
+    let error = $state(null);
     let docType = $state(null);
     let document = $state({
         type : +router.query.document_type,
@@ -93,12 +93,12 @@
 </style>
 
 <fieldset>
-    {#if docType}
-    <legend>{t('document.add_new',docType)}</legend>
-    {/if}
     {#if error}
     <span class="error">{error}</span>
     {/if}
+    {#if docType}
+    <legend>{t('document.add_new',docType)}</legend>
+    {/if}
     {#if company}
     Company: {company.name}
     <fieldset>