making sure that if AJAX request fails, then the whole operation is cancelled (previously the promise has been resolved successfully even in case of failed request)

public/javascripts/server.js

@@ -82,6 +82,8 @@ const server = (function() {
 
         return await $.ajax(options).catch(e => {
             showError("Error when calling " + method + " " + url + ": " + e.status + " - " + e.statusText);
+
+            throw e;
         });
     }