fix permission code check

src/routes/(angemeldet)/upload/+page.svelte

@@ -158,42 +158,37 @@
 		}
 	}
 
-	///(angemeldet)/view return true or false
+	// `/(angemeldet)/view` return true or false
 	async function case_exists(case_no) {
-		// ping `` with caseNumber in POST body
+
+		if (case_no == '') {
+			zuganscode = zugangscode_old;
+		}
+
+		// ping `/view` with caseNumber in POST body
 		let url = '/view';
+
 		let data = new FormData();
 		data.append('caseNumber', case_no);
 
-		console.log('--- case exist_func', case_no)
-
 		// fetch code in parallel
-		const code = get_code(case_no);
+		const code = await get_code(case_no);
+		if (code != -1) {
+			zugangscode = code;
+			case_existing = true;
+			return true
+		}
 
 		const response = await fetch(url, { method: 'POST', body: data });
 
 		const res_json = await response.json();
-		console.log(`+++ ${res_json.data}`)
 		const status = res_json.status;
 
-		// aktualisiere Zugangscode mit
-		if (status == 303) {
-			case_existing = true;
-
-			const res = await code;
-
-
-			if (res != -1) {
-				// Code vorhanden
-				zugangscode = res;
-			}
-
-			return true;
+		if (status != 303) {
+			case_existing = false;
+			zugangscode = zugangscode_old;
 		}
 
-		case_existing = false;
-		zugangscode = zugangscode_old;
-
 		return false;
 	}