Getting target of empty Handle causes NPE

[tschneidereit]

Example: using valueHandle->IsObject() if valueHandle is empty causes a NPE because -> returns a NULL pointer.

We should check what V8 does and emulate their behavior. I guess the correct result would be to return false.

[zpao]

false sounds reasonable, but yea, we should do what V8 does. If there isn't a test in test-api that we haven't brought over yet, then we should add one.

[tschneidereit]

In fact, we should add tests for all of a Handle's methods that act on the handled pointer instead of the handle itself. I don't think that we can generalize that, short of creating a default item for empty Handles.

I'll check into what V8 does, though.

[tschneidereit]

So maybe I should have just checked immediately: V8 asserts that the value isn't NULL. I guess we should simply do the same and be done with it, then.