[ruby-cvs:78643] 7d991a0571 (master): Suppress to crash IRB if completed list has nil

"aycabta" <[email protected]>
Newsgroups gmane.comp.lang.ruby.cvs
Message-ID <[email protected]> 
aycabta	2019-12-12 08:40:44 +0900 (Thu, 12 Dec 2019)

  New Revision: 7d991a0571

  https://github.com/ruby/ruby/commit/7d991a0571

  Log:
    Suppress to crash IRB if completed list has nil

  Modified files:
    lib/reline/line_editor.rb
    test/reline/test_key_actor_emacs.rb
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