fix: unbind when el doesn't have parent node (#3) In some cases the `el` to unbind it's the root node, so it doesn't have a parent node which causes an error: `TypeError: Cannot read property 'removeChild' of null`.
fix: unbind when el doesn't have parent node (#3) In some cases the `el` to unbind it's the root node, so it doesn't have a parent node which causes an error: `TypeError: Cannot read property 'removeChild' of null`.