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Add a hint for empty input and pressing ESC during prompts

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Added this hint because it's not obvious for newcomers and because the task requires to check prompt for two different values to give alert('Canceled').
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snakecase 2018-03-11 11:00:24 +05:00 • committed by GitHub
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1-js/02-first-steps/10-ifelse/4-check-login/task.md
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@ -20,4 +20,6 @@ The schema:
Please use nested `if` blocks. Mind the overall readability of the code. Please use nested `if` blocks. Mind the overall readability of the code.
Hint: passing an empty input to a prompt returns an empty string `''`. Pressing `key:ESC` during a prompt returns `null`.
[demo] [demo]