Grégoire Geis 72161a64b2 @babel/traverse: Fix NodePath.getData (#9415)
* @babel/traverse: Fix NodePath.getData

Currently, if the obtained value is `false`, it will be replaced by the given default value, which is invalid. This makes sure that we only set the default value when the value is `undefined`, instead of falsy.

* Add test and fix object protoype

* Allow false as default value
2019-03-26 16:58:38 -07:00
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