fix: Fix an issue where the updatePlayer method would throw when using iframe embeds (#96)

Author: randresfbc

src/index.js

@@ -237,7 +237,7 @@ class ReactPlayerLoader extends React.Component {
   updatePlayer(changes) {
 
     // No player exists, player is disposed, or not using the catalog
-    if (!this.player || !this.player.el()) {
+    if (!this.player || !this.player.el || !this.player.el()) {
       return;
     }