Don't append zero length card list to section pages
Don't append zero length card list to section pages

In the presented we would always call the card modifiers on the
section page after attempting to load more results, even if no
results were returned.

This was causing us to loop forever trying to load more results
in template B in some cases
[endlessm/eos-sdk#1915]

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib