In Scope::Print, skip null scope_names_ just like empty ones

src/scopes.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/scopes.h"
 
 #include "src/accessors.h"
 #include "src/bootstrapper.h"
 #include "src/messages.h"
 #include "src/parser.h"
@@ skipping 920 matching lines @@
   }
 }
 
 
 void Scope::Print(int n) {
   int n0 = (n > 0 ? n : 0);
   int n1 = n0 + 2;  // indentation
 
   // Print header.
   Indent(n0, Header(scope_type_, function_kind_, is_declaration_scope()));
-  if (!scope_name_->IsEmpty()) {
+  if (scope_name_ != nullptr && !scope_name_->IsEmpty()) {
     PrintF(" ");
     PrintName(scope_name_);
   }
 
   // Print parameters, if any.
   if (is_function_scope()) {
     PrintF(" (");
     for (int i = 0; i < params_.length(); i++) {
       if (i > 0) PrintF(", ");
       const AstRawString* name = params_[i]->raw_name();
@@ skipping 695 matching lines @@
       function_ != NULL && function_->proxy()->var()->IsContextSlot();
   return num_heap_slots() - Context::MIN_CONTEXT_SLOTS - num_global_slots() -
          (is_function_var_in_context ? 1 : 0);
 }
 
 
 int Scope::ContextGlobalCount() const { return num_global_slots(); }
 
 }  // namespace internal
 }  // namespace v8