Bug: typefully will publish an empty draft containing 0 tweets via hotkey

Reproduce:
-> https://typefully.com/
Don't type anything, but cursor to the textbox. Note the grayed out Schedule/Tweet buttons, unclickable.
on MacOS: Cmd+Shift+Enter opens the Tweet modality, allowing user to attempt to publish an empty tweet (nothing will be published to twitter).

Frankly I'd make my own PR to add this, but it looks like your product isn't open soooooource.