[bug #60389] [PATCH] contrib/mm/m.tmac: omit a comma, if macro "let@sg_SP" is called with one argument

[G. Branden Robinson]

Update of bug #60389 (project groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #3:


commit aac2e49db9237f31d362b5cb5c79a023a4accc20
Author: Bjarni Ingi Gislason <bjarniig@rhi.hi.is>
Date:   Tue May 25 20:02:02 2021 +0000

    Fix Savannah #60373 (2/3).
    
    * contrib/mm/m.tmac (let@sg_SP): Stop placing a comma after the
      first argument (an author name set by AU) if the second argument is
      empty (an author title set by AT).
    
    Solves another part of bug #60373, "the writer's name at the bottom is
    followed by a trailing comma".
    
    Fixes <https://savannah.gnu.org/bugs/?60389>.
    
    [Patch restyled to fit the conventions of the source file. --GBR]


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