service fails silently when CSV doesn't have a header value

[bradnoble]

https://www.dropbox.com/s/06dz37k1ep1zbfa/Screenshot%202016-07-01%2014.57.16.png?dl=0

[glynnbird]

That is such a good spot. When SSS uses couchimport to preview the file, couchimport will return data like this if there is a missing heading:

{ a: '1', b: '2', '': '3' }

This should be detected in the SSS code? @vabarbosa ?