WysiwygEditor throws when unmounted with a dialog open #57

WysiwygEditor throws if it unmounts while one of its dialogs is open:

TypeError: Cannot read properties of null (reading 'commands')
  at afterDialog (src/editor/wysiwyg-editor.tsx)

Radix's close-focus timer calls afterDialog after the editor has been destroyed. BlockEditor has the same afterDialog pattern and probably does the same; that isn't tested.

A test hit this in 0.2.0 and was fixed by closing the dialog first, so the component still has the bug. An app can hit it by navigating away with a dialog open.

Fix: guard afterDialog against a missing or destroyed editor in both components, with a test that unmounts with a dialog open.

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