When volume support is disabled trove list does not contain include
a volume attribute in the response. Previously we would only add a
value for size when the volume attribute was present. This change
adds a value of '-' when there is no volume attribute. This makes
the behaviour consistent with the behaviour of nova list where the
task state has no value.
Change-Id: I75e5f7c493f3d2fe938ecc8663457953c58f6b02
Closes-Bug:1394591