fix, PEBKAC, don't crash on empty intersections

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'cmd/show' into next

* cmd/show:
  fix, PEBKAC, don't crash on empty intersections
Merge branch 'next'

* next:
  fix, PEBKAC, don't crash on empty intersections