fix rh distro to work across all rh platforms
Merge pull request #13 from movitto/rh-distro-fix

fix rh distro to work across all rh platforms
Return an empty array of partitions on a non-zero rc from parted.

In the event the disk label/partition table is missing, parted exits with the fixnum 1 from Linux Admin.
Merge pull request #15 from jrafanie/return_empty_array_on_non_zero_parted_rc

Return an empty array of partitions on a non-zero rc from parted.