The Compliance::API.version method could potentially return
a hash containing no "version" key but would return an empty
hash upon any expected failure. Downstream callers of the
Compliance::API.version method were looking for a "version"
key to always be present when, in some cases, it would not be.
This change ensures that if a version is not available, there
is no "version" key in the hash, and downstream callers of this
method have been changed to check for nil instead of empty.
Signed-off-by: Adam Leff <adam@leff.co>
