bin/42144: /usr/bin/vi gives user-unfriendly message when TERM isn't be set

[Ryo HAYASAKA <ryoh%jaist.ac.jp@localhost>]

>Number:         42144
>Category:       bin
>Synopsis:       /usr/bin/vi gives user-unfriendly message when TERM isn't be 
>set
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Fri Oct 02 08:25:00 +0000 2009
>Originator:     Ryo HAYASAKA
>Release:        NetBSD 5.99.19
>Organization:
Japan Advanced Institute of Science and Technology (JAIST)
>Environment:
System: NetBSD bonnie.jaist.ac.jp 5.99.19 NetBSD 5.99.19 (GENERIC) #0: Tue Sep 
29 16:25:27 JST 2009 
root%bonnie.jaist.ac.jp@localhost:/f/obj/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:
$ unset TERM
$ vi
ex/vi: Error: unknown: Invalid argument

Users can't understand what's wrong from the error message.
        
>How-To-Repeat:
Improve the message.
        
>Fix: