[w3c/manifest] The curious (special) case of orientation (#463)

@mounirlamouri I can't remember why, but we made processing the `orientation` member default to  the empty string instead of underfined:

>   If Type(value) is not "undefined", issue a developer warning that the type is not supported.
>   Return the empty string.

However, in Gecko, we want to take the normalized web manifest and convert it into a WebIDL dictionary and make orientation adhere to the `OrientationLockType` of The Screen Orientation API.  

Would it be ok to change the spec to no longer return the empty string and just return undefined? Does that impact you at all? 

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