guarantee no 'null' quality option.

Author: nholtman

dist/quality/quality.js

@@ -63,7 +63,7 @@ Object.assign(MediaElementPlayer.prototype, {
 			var mediaNode = children[i];
 			var quality = mediaNode instanceof HTMLElement ? mediaNode.getAttribute('data-quality') : mediaNode['data-quality'];
 
-			if (quality === 'undefined') {
+			if (quality === 'undefined' || quality == null) {
 				quality = 'Auto';
 				t.options.autoGenerateQualityOptionsFromManifest = true;
 			}

dist/quality/quality.min.js

@@ -1,6 +1,6 @@
 {
   "name": "@A-VISION-BV/mediaelement-plugins",
-  "version": "4.1.4",
+  "version": "4.1.5",
   "repository": {
     "type": "git",
     "url": "https://github.com/A-VISION-BV/mediaelement-plugins.git"

package-lock.json

@@ -100,8 +100,9 @@ Object.assign(MediaElementPlayer.prototype, {
 		for (let i = 0, total = children.length; i < total; i++) {
 			const mediaNode = children[i];
 			let quality = mediaNode instanceof HTMLElement ? mediaNode.getAttribute('data-quality') : mediaNode['data-quality'];
-
-			if (quality === 'undefined') {
+			
+			
+			if (quality === 'undefined' || quality == null) {
 				quality = 'Auto';
 				t.options.autoGenerateQualityOptionsFromManifest = true;
 			}