Treat NO_COLOR="" the same as unset

The docs say

> Command-line software which adds ANSI color to its output by default
> should check for a NO_COLOR environment variable that, when present
> and not an empty string (regardless of its value), prevents the
> addition of ANSI color.

but we were not checking for the empty string.

Link: https://no-color.org/
Link: https://github.com/sharkdp/fd/pull/1421

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