[BUG]: double monocle a lone window on a desktop results in it having no container

[raggi]

Describe the bug

If you toggle monocle twice on a window that is the sole window in the sole workspace on a monitor, the toggle on/off works (after the fix for the panic described in #757), but the monitor is left with no workspace, and the window is left orphaned, so it can no longer be focused by commands.

To Reproduce
Steps to reproduce the behavior:

1. Open a single window on a single monitor
2. Toggle monocle twice
3. Focus a window on a second monitor
4. Observe inability to focus original window, as there is no container in that direction
5. Focus the orphaned window, observe inability to focus windows in other directions due to "no container"

Expected behavior
The window should have a container after it is restored from monocle.

Additional context
There is some kind of logic bug that would cause a panic, that is described in #757, that will be fixed independently - but may now further hide the bug.

[LGUG2Z]

@RaptDept this is technically "fixed" here, but the fix could be improved:

6fce630