Add null checks of message->Get() in V8Initializer.cpp
Add null checks of message->Get() in V8Initializer.cpp

message->Get() can be empty at least in promiseRejectHandlerInWorker() and caused crash.

BUG=450330

Review URL: https://codereview.chromium.org/933533002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@190406 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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