From 89ed7a327bdaf6aa5c53a81621adebb2fbba49a7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lukas=20F=C3=BCrderer?= <l.fuerderer@gmail.com>
Date: Tue, 25 Aug 2020 18:54:15 +0200
Subject: [PATCH] Allow null-values for additional cards

When null is given, there is no card to assign

There is currently no placeholder for the missing space.
This means, if a row has no card at some column it must also have no card
at any later column.
---
 quiz.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/quiz.js b/quiz.js
index 1820b81..a916a2f 100644
--- a/quiz.js
+++ b/quiz.js
@@ -69,7 +69,9 @@ function shuffle(a) {
 function shuffle_cards(section) {
     let a = [];
     for (let i=0; i<cards_content[section].length; i++) {
-        a.push(i);
+        if (cards_content[section][i] != null) {
+            a.push(i);
+        }
     }
     shuffle(a);
     return a;