Does not copy empty string to clipboard

[gitname]

When value of the text prop is an empty string (i.e. ""), the result parameter inside onCopy is true, but the empty string is not copied to the clipboard. Instead, the clipboard retains whatever was already on it.

Demo: https://codepen.io/anon/pen/VyvgOr

• This demo is a fork of the demo linked in README.md. The only difference is that state.value has been initialized to an empty string (i.e. "") instead of to "some\ntext". To reproduce the issue, you can manually pre-load your clipboard with a non-empty string (e.g. "abc") and then click on the "Copy to clipboard with button" button in the demo. Although the demo will show the red "Copied" message (suggesting, to me, that the empty string has been copied to the clipboard), the clipboard will continue to contain the previous string (e.g. "abc") instead of the empty string.

I expected the clipboard to contain the empty string (i.e. I expected the clipboard to be empty).

Observed in:

• Chrome Version 62.0.3202.94 (Official Build) (64-bit) running on Windows 7 64-bit

[nkbt]

There is no explicit checks in react-copy-to-clipboard an copy-to-clipboard (that it uses), feels like it may be a default browser behaviour =(