Gracefully handle NoLinterError

We forgot to include a handler for this exception in the CLI.

Change-Id: Idc2194b3e3eec2072200e794781e053142a111ee
Reviewed-on: http://gerrit.causes.com/42350
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>