[w3c/editing] `selectAll` command should be disabled if no selection exists on the context object (Issue #475)

The spec for `queryCommandEnabled` [states](https://github.com/w3c/editing/blob/b9fbe88d2319c5667a008804c2364023ce4ccec0/docs/execCommand/index.html#L589-L592) that all commands in the Miscellaneous section are always enabled. However, the steps for `selectAll` require that `document.getSelection()` does not return `null`. My suggestion is to disable the command whenever there is no selection available to work with.

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