[bug #61070] [troff] want to drop default "User Abort." text from .ab request

[G. Branden Robinson]

Update of bug #61070 (project groff):

                  Status:               Need Info => In Progress            

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Follow-up Comment #5:

Unix Version 7 nroff said exactly "User Abort." if .ab was given no arguments,
and exited _with status zero_  (shame!  SHAME!).


PDP-11 simulator V3.8-1
sim> set cpu 11/45
Disabling XQ
sim> set tto 7b
sim> att rl unix_v7_rl.dsk
sim> boot rl
@boot
New Boot, known devices are hp ht rk rl rp tm vt 
: rl(0,0)rl2unix
mem = 177856
# Restricted rights: Use, duplication, or disclosure
is subject to restrictions stated in your contract with
Western Electric Company, Inc.
Thu Sep 22 06:42:34 EDT 1988

login: dmr
$ nroff
.ab
User Abort.
$ echo $?
0
$ nroff
.ab foo
foo
$ echo $?
0


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