Commits on Dec 10, 2021

1. feat(completion): add default completion hidden if there are no subco… …

   …mmands
   
   The default completion is useful also in cases where there are no
   subcommands, for example to provide completion for flags, and custom
   completions for their values.
   
   But when there are no subcommands, make it hidden. Simply adding it
   non-hidden would result in a help section to be added just for it which
   is just noise: the completion command is not the primary functionality
   of the program, yet it would be prominently displayed in help output. It
   would also get included among argument completions, which could be a
   source of confusion.

   

   scop committed Dec 10, 2021
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