[bug #60802] [troff] make .substring handle an empty result

[G. Branden Robinson]

Update of bug #60802 (project groff):

              Item Group:     Incorrect behaviour => Feature change         
                 Summary: Make .substring handle an empty result => [troff]
make .substring handle an empty result

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Follow-up Comment #6:

This is the most significant feature change pending.  I can't promise I'll get
to it for 1.23, but I'm not giving up yet. 

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