[FIX] mail: prevent crash when focusout emoji button

Before this commit, on a clear session, there was a traceback
after focusing out the emoji button next to the composer.

This is due to a DOM element that exists only after clicking on
the emoji button, and it was wrongly assumed that focusout cannot
occur without a preceding click. Indeed, we can press TAB to move
between focusable elements, so that we can have the focus in/out
on the button without clicking on it.

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