Before this commit, while performing a check on whether a customization
being imported was done using studio or not, we would assume that the
.zip would, at the very least, contain a data folder.
This is not the case as loose files can be imported and the data folder
is only generated by studio customizations.
To solve this, we walk over the whole zip instead of walking over the
data/ folder only (which may be non-existant), so loose files, files
inside the data folder and potentially files in other folders can be
parsed without raising unexpected errors.
Adrian Torres
d33ce2b4d1