[bug #62181] [me] setting of hyphenation mode not robust to meddling

[G. Branden Robinson]

Update of bug #62181 (project groff):

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

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Follow-up Comment #1:


commit a7853c5b5bb975a6e058238405bb0080a9a4a19a
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Tue Mar 15 18:17:42 2022 +1100

    [me]: Fix Savannah #62181.
    
    * tmac/e.tmac: Test register for existence before using it to set
      hyphenation mode.  A site troffrc or other local customization might
      remove the register (which is guaranteed to be set under the stock
      configuration) and, perversely, Heirloom Doctools troff interprets a
      `do` request, instead of ignoring it as a historical troff
      implementation would, so if they borrow our me(7) changes, the
      register would be unset, interpolate zero, and hyphenation would wind
      up disabled.
    
    Fixes <https://savannah.gnu.org/bugs/?62181>.  Thanks to Dave Kemper for
    the report.



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