Better handling debug evaluation when there is no JavaScript stack

src/debug-delay.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1403 matching lines @@
     response.body =
         this.exec_state_.evaluateGlobal(expression), Boolean(disable_break);
     return;
   }
 
   // Default value for disable_break is true.
   if (IS_UNDEFINED(disable_break)) {
     disable_break = true;
   }
 
+  // No frames no evaluate in frame.
+  if (this.exec_state_.frameCount() == 0) {
+    return response.failed('No frames');
+  }
+
   // Check whether a frame was specified.
   if (!IS_UNDEFINED(frame)) {
     var frame_number = %ToNumber(frame);
     if (frame_number < 0 || frame_number >= this.exec_state_.frameCount()) {
       return response.failed('Invalid frame "' + frame + '"');
     }
     // Evaluate in the specified frame.
     response.body = this.exec_state_.frame(frame_number).evaluate(
         expression, Boolean(disable_break));
     return;
@@ skipping 275 matching lines @@
       json += NumberToJSON_(elem);
     } else if (IS_STRING(elem)) {
       json += StringToJSON_(elem);
     } else {
       json += elem;
     }
   }
   json += ']';
   return json;
 }