Merge branch 'release' into stable

card.js

@@ -99,4 +99,17 @@
   MemoryGame.Card.prototype = Object.create(EventDispatcher.prototype);
   MemoryGame.Card.prototype.constructor = MemoryGame.Card;
 
+  /**
+   * Check to see if the given object corresponds with the semantics for
+   * a memory game card.
+   *
+   * @param {object} params
+   * @returns {boolean}
+   */
+  MemoryGame.Card.isValid = function (params) {
+    return (params !== undefined &&
+            params.image !== undefined &&
+            params.image.path !== undefined);
+  };
+
 })(H5P.MemoryGame, H5P.EventDispatcher, H5P.jQuery);

library.json

@@ -3,7 +3,7 @@
   "description": "See how many cards you can remember!",
   "majorVersion": 1,
   "minorVersion": 1,
-  "patchVersion": 6,
+  "patchVersion": 8,
   "runnable": 1,
   "author": "Amendor AS",
   "license": "MIT",

memory-game.js

@@ -101,12 +101,14 @@ H5P.MemoryGame = (function (EventDispatcher, $) {
 
     // Initialize cards.
     for (var i = 0; i < parameters.cards.length; i++) {
+      if (MemoryGame.Card.isValid(parameters.cards[i])) {
         // Add two of each card
         var cardOne = new MemoryGame.Card(parameters.cards[i], id);
         var cardTwo = new MemoryGame.Card(parameters.cards[i], id);
         addCard(cardOne, cardTwo);
         addCard(cardTwo, cardOne);
       }
+    }
     H5P.shuffleArray(cards);
 
     /**