commands: fix handing of ENO_SUCH_CMD in script

Fix the error messages when an unrecognized command is
run from a script.  We shouldn't attempt to parse options
for an unrecognized command name, which causes misleading
errors about bad options, but rather exit right when we
know the command name is not valid.  Also don't complain
about exiting without an error message when running a
script if no command didn't exist.

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