From 2a2f5da39f9e243eda66e84be9c9e16538886f49 Mon Sep 17 00:00:00 2001
From: Florian Rappl <mail@florian-rappl.de>
Date: Thu, 16 Feb 2023 09:02:12 +0100
Subject: [PATCH] Empty string behaves like null

---
 src/AngleSharp.Css/Dom/Internal/MediaList.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/AngleSharp.Css/Dom/Internal/MediaList.cs b/src/AngleSharp.Css/Dom/Internal/MediaList.cs
index 215b4716..d7b4c942 100644
--- a/src/AngleSharp.Css/Dom/Internal/MediaList.cs
+++ b/src/AngleSharp.Css/Dom/Internal/MediaList.cs
@@ -56,7 +56,8 @@ public String MediaText
         public void SetMediaText(String value, Boolean throwOnError)
         {
             _media.Clear();
-            var media = MediaParser.Parse(value ?? CssKeywords.All, ValidatorFactory);
+            var v = String.IsNullOrEmpty(value) ? CssKeywords.All : value;
+            var media = MediaParser.Parse(v, ValidatorFactory);
 
             if (media != null)
             {