[bug #67890] [troff] `ab` and `tm{, 1, c}` request handlers leave input parser in wrong state

[G. Branden Robinson]

Update of bug #67890 (group groff):

                  Status:               Confirmed => In Progress

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Follow-up Comment #5:

I'll be reverting this, but I observe that `ab` emitting a blank line if there
is no argument makes it congruent with `tm`.


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