Make default completer work on blank lines #923
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The default completer currently doesn't show any suggestions if you hit tab without entering anything. This PR makes it show all suggestions when given either an empty line or a line that's all spaces. Not super important, but should help confuse new users less (#921 was opened by a user who thought completions weren't working because of this behavior).
Screenshot:
I also touched the surrounding code a teeny bit, but nothing major.