From 2a98c4e8d47858215fbacb79c5f9fe65d2475907 Mon Sep 17 00:00:00 2001
From: Gabriel Augendre <gabriel@augendre.info>
Date: Sat, 8 Jun 2019 17:16:27 +0200
Subject: [PATCH] Prevent field blocking if search decitre with empty ISBN

---
 manuels/static/manuels/fetch-isbn.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/manuels/static/manuels/fetch-isbn.js b/manuels/static/manuels/fetch-isbn.js
index 32ae1e8..f20ab21 100644
--- a/manuels/static/manuels/fetch-isbn.js
+++ b/manuels/static/manuels/fetch-isbn.js
@@ -39,6 +39,9 @@ document.addEventListener("DOMContentLoaded", function (event) {
     }
 
     isbnButton.addEventListener('click', function (event) {
+        if (!isbn.value) {
+            return;
+        }
         disableFields();
 
         $.get("/isbn_api/" + isbn.value, {}, function (data, status, xhr) {