Generalize matching so that if the matchspec is empty, all items are matched.
Generalize matching so that if the matchspec is empty, all items are matched.

Signed-off-by: Jon Seymour <44f878afe53efc66b76772bd845eb65944ed8232@ninjablocks.com>

ninjasphere/app-presets,ninjasphere/app-presets