CLI: Should the zero-args implicit help return a non-zero error code? #246
Description
As mentioned in fastapi/typer#1240, click (and hence typer) changed their handling of the "display help with zero arguments" case to return a non-zero exit code (distinguishing it from explicitly requesting the help output with the --help option)
vevnstacks is currently using a workaround to restore the old behaviour of having venvstacks and venvstacks --help both return zero as the exit code.
However, the rationale for the underlying CLI libraries making the change is fairly compelling: while venvstacks --help is a non-error response to the specific request made, having venvstacks print the help text is more a matter of saying "That isn't a valid request, here's the usage message so the next request can be populated correctly".