Be more friendly about shlex parsing errors
Be more friendly about shlex parsing errors

If user provides bad input, be more helpful and
less fatalistic.

xcat2/confluent,whowutwut/confluent,jjohnson42/confluent,jjohnson42/confluent,jjohnson42/confluent,xcat2/confluent,jjohnson42/confluent,xcat2/confluent,whowutwut/confluent,jjohnson42/confluent,whowutwut/confluent,whowutwut/confluent,xcat2/confluent,xcat2/confluent