Don't crash if we get a timezone change notification on an uninitialized isolate

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 5dcf592296f6f84d82491d3b1f3a4ca0381c6d3f..5d49cd9107b232c40360f9ea38d5541ed94d5050 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -5710,6 +5710,7 @@ double v8::Date::ValueOf() const {
 
 void v8::Date::DateTimeConfigurationChangeNotification(Isolate* isolate) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  if (!isolate->IsInitialized()) return;
   ON_BAILOUT(i_isolate, "v8::Date::DateTimeConfigurationChangeNotification()",
              return);
   LOG_API(i_isolate, "Date::DateTimeConfigurationChangeNotification");