Context menu should skip any menu construct whose submenu label is the empty string.

Source/core/page/CustomContextMenuProvider.cpp

Index: Source/core/page/CustomContextMenuProvider.cpp
diff --git a/Source/core/page/CustomContextMenuProvider.cpp b/Source/core/page/CustomContextMenuProvider.cpp
index d59802977b0909bc315f5837c2c61aaeae2c4ec6..0bd522c24da53527778c98056972c89ee36f99b3 100644
--- a/Source/core/page/CustomContextMenuProvider.cpp
+++ b/Source/core/page/CustomContextMenuProvider.cpp
@@ -85,11 +85,11 @@ void CustomContextMenuProvider::populateContextMenuItems(const HTMLMenuElement&
         } else if (isHTMLMenuElement(*nextElement)) {
             ContextMenu subMenu;
             String labelString = nextElement->fastGetAttribute(labelAttr);
-            if (labelString.isEmpty()) {
+            if (labelString.isNull()) {
                 appendSeparator(contextMenu);
                 populateContextMenuItems(*toHTMLMenuElement(nextElement), contextMenu);
                 appendSeparator(contextMenu);
-            } else {
+            } else if (!labelString.isEmpty()) {
                 populateContextMenuItems(*toHTMLMenuElement(nextElement), subMenu);
                 contextMenu.appendItem(ContextMenuItem(SubmenuType, ContextMenuItemCustomTagNoAction, labelString, &subMenu));
             }