Exit with code 1 on bad command; bump version to 1.4.1

@civitaslearning/data-platform This is the real fix for DP-174 ... coming soon to `civetl` is pulling in this version of the package (1.4.1) instead of the 18-month-old 1.4 package (interestingly and annoyingly, 1.4 was not available from the upstream github repo, I had to unpack it and push it in the master branch)

Worse than unnecessary, it constitutes a syntax error.  The pip would not install without fixing this.