Make 0 items outcome more visible

[manycoding]

Currently if a filtered job returns 0 items, the first test simply fails. While there're some hints which point on the number of returned errors - 0it, it's not visible enough.

g = Gatf(source='2235/1276/18', 
         schema='schemas/Netflix-FTE/netflix-show.json',
         target='2235/1276/18',
         filters=[("META_TEMPLATE_NAME", "=", ["Title"])],
         expand=False)