FIX: getFullSiteDomainNormalized() could never return false.

getFullSiteDomainNormalized() and getMobileDomainNormalized() don't
check if a domain is actually set before validating it. This resulted
in both functions returning 'http://' instead of false when no domain
was present.
Merge pull request #37 from kinglozzer/get_domains_fix

FIX: getFullSiteDomainNormalized() could never return false.