Throw exception if FileId did not resolve. (#5)
Throw exception if FileId did not resolve. (#5)

If we're unable to look up the FileId, this means that the FileName and
BucketName combination did not resolve to a valid file. We therefor throw
a NotFoundException, instead of continuing to try to request file
information without the required information to do so.
cwhite92/b2-sdk-php