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repl: fix passing an empty line inserting "undefined" into the buffer
There was a possiblity of insering the string "undefined" into the repl's command buffer, which would cause interesting results while evaluating.
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9126dd2
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@TooTallNate :
debugger relied on this:
https://github.com/joyent/node/blob/master/lib/_debugger.js#L955
it would be nice to fix it too :)