Remove NoLintersError

This error check is no longer valid now that it is perfectly reasonable
for a set of files to have no linters enabled for them, since the
configuration system now allows you to do this quite easily.

Change-Id: Ic979c6770b5e72cc78d3fd714ff5d58ac04ad210
Reviewed-on: https://gerrit.causes.com/31533
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>