[bug #66151] [troff] some requests read through newline when given no arguments

[G. Branden Robinson]

Update of bug #66151 (group groff):

                  Status:                    None => In Progress            
             Assigned to:                    None => gbranden               

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Follow-up Comment #1:


$ ./build/test-groff -U
.pi
nonexistent
foobar
sh: 1: nonexistent: not found
$ ./build/test-groff -aww
.sizes
hello, world
troff: warning: invalid size range 'hello,'
$ ./build/test-groff -aww



.while
1 foobar
troff:<standard input>:2: warning: numeric expression missing


The last one is a little different; `while` doesn't really read through the
newline, but its diagnostic is belated because it didn't `skip_line()` when it
saw that it had no useful arguments (because it didn't look to verify that).


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