php maintenance/install.php --help
"--pass: The password for the wiki administrator. You will be
prompted for this if it isn't provided"
Expected: It asks for a password if not provided
What happens: It tries to use an empty password, then fail because it's too short.
Version: 1.18.x
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=36069