Fixed crash by checking if m_layoutObject->node() is not nullptr before calling isContentRichlyEdit…

Source/modules/accessibility/AXLayoutObject.cpp

Index: Source/modules/accessibility/AXLayoutObject.cpp
diff --git a/Source/modules/accessibility/AXLayoutObject.cpp b/Source/modules/accessibility/AXLayoutObject.cpp
index f1ca2df749ea94bc696413dc07ae1ee75562d896..63b98a2f16d6dff009536f948c0fd6faf42f08b4 100644
--- a/Source/modules/accessibility/AXLayoutObject.cpp
+++ b/Source/modules/accessibility/AXLayoutObject.cpp
@@ -375,15 +375,12 @@ static bool isLinkable(const AXObject& object)
     return object.isLink() || object.isImage() || object.layoutObject()->isText();
 }
 
+// Requires layoutObject to be present because it relies on style
+// user-modify. Don't move this logic to AXNodeObject.
+// TODO(nektar): Implement support in AXNodeObject for aria-hidden and canvas.
 bool AXLayoutObject::isRichlyEditable() const
 {
-    ASSERT(node());
-    ASSERT(m_layoutObject);
-
-    // Requires m_layoutObject to be present because it relies on style
-    // user-modify. Don't move this logic to AXNodeObject.
-    // TODO(nektar): Implement support in AXNodeObject for aria-hidden and canvas.
-    if (node()->isContentRichlyEditable())
+    if (node() && node()->isContentRichlyEditable())
         return true;
 
     if (isWebArea()) {