LibWeb: Make empty media query lists evaluate to true

Author: https://github.com/Gingeh
Commit: 16f2f6aa42
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1611
Reviewed-by: https://github.com/AtkinsSJ ✅

Userland/Libraries/LibWeb/CSS/MediaQueryList.cpp

@@ -51,10 +51,14 @@ String MediaQueryList::media() const
 // https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-matches
 bool MediaQueryList::matches() const
 {
+    if (m_media.is_empty())
+        return true;
+
     for (auto& media : m_media) {
         if (media->matches())
             return true;
     }
+
     return false;
 }
 
@@ -64,6 +68,9 @@ bool MediaQueryList::evaluate()
     if (!window)
         return false;
 
+    if (m_media.is_empty())
+        return true;
+
     bool now_matches = false;
     for (auto& media : m_media) {
         now_matches = now_matches || media->evaluate(*window);