DocumentContext map creates new property under certain conditions

[knservis]

Hi,

I have created a failing test case to demonstrate the issue here:
knservis@e8d54c4

Basically when using DocumentContext.map and one of the paths is non-existent like $.exists.['exists', 'does-not-exist'] the map will be called twice and will create a new property (the output will contain an empty object under that key).

Is this a feature or a bug? @jochenberger