IDL compiler: move EventHandler null check out of generated bindings

Source/bindings/tests/results/V8TestObjectPython.cpp

 /*
     This file is part of the Blink open source project.
     This file has been auto-generated by CodeGeneratorV8.pm. DO NOT MODIFY!
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
 
     This library is distributed in the hope that it will be useful,
@@ skipping 1333 matching lines @@
 static void eventHandlerAttributeAttributeGetterCallback(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("Blink", "DOMGetter");
     TestObjectPythonV8Internal::eventHandlerAttributeAttributeGetter(name, info);
     TRACE_EVENT_SET_SAMPLING_STATE("V8", "Execution");
 }
 
 static void eventHandlerAttributeAttributeSetter(v8::Local<v8::String> name, v8::Local<v8::Value> jsValue, const v8::PropertyCallbackInfo<void>& info)
 {
     TestObjectPython* imp = V8TestObjectPython::toNative(info.Holder());
-    if (!jsValue->IsNull() && !jsValue->IsFunction())
-        jsValue = v8::Null(info.GetIsolate());
     transferHiddenDependency(info.Holder(), imp->eventHandlerAttribute(isolatedWorldForIsolate(info.GetIsolate())), jsValue, V8TestObjectPython::eventListenerCacheIndex, info.GetIsolate());
     imp->setEventHandlerAttribute(V8EventListenerList::getEventListener(jsValue, true, ListenerFindOrCreate), isolatedWorldForIsolate(info.GetIsolate()));
 }
 
 static void eventHandlerAttributeAttributeSetterCallback(v8::Local<v8::String> name, v8::Local<v8::Value> jsValue, const v8::PropertyCallbackInfo<void>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("Blink", "DOMSetter");
     TestObjectPythonV8Internal::eventHandlerAttributeAttributeSetter(name, jsValue, info);
     TRACE_EVENT_SET_SAMPLING_STATE("V8", "Execution");
 }
@@ skipping 1817 matching lines @@
     V8DOMWrapper::associateObjectWithWrapper<V8TestObjectPython>(impl, &info, wrapper, isolate, WrapperConfiguration::Independent);
     return wrapper;
 }
 
 void V8TestObjectPython::derefObject(void* object)
 {
     fromInternalPointer(object)->deref();
 }
 
 } // namespace WebCore