Fixed for JADE 0.1.3. Please send your real name to creator(at)ancientdomainsofmystery.com for it to be included in the credits.

This is fixed in most cases, but here I am standing at a point with one door southeast of me and the start of a long corridor northeast of me. When I try to close the door at the southeast it gives the 'close which door?' text. Apparently your code seems to recognize any transition from room to corridor as a potential door to close (even when there is no door at all).
Closing a random spot results in 'You don't see any door' while trying to close the start of an open corridor results in 'there is nothing here to close'. The same all happens for opening btw. Trying to close a corridor without door when you are not next to a door gives the proper 'there is nothing here to close' message automatically.
With some more testing you can also choose a direction to close/open doors when you are next to two open starting corridors without doors.

There's still a minor problem as passages count as doors.

Fixed for JADE 0.1.4. Please send your real name to creator(at)ancientdomainsofmystery.com for it to be included in the credits. (If you were aleady asked to do so you can ignore this message. Please include a reference to the bug or RFE you are credited for.)

There is still a minor problem with this in version 0.1.4. I stay between 2 doors, one is closed, one is open. If I press 'c' then it asks 'Close which door?', but it should be obvious that I want to close that door which is open. The same thing happens for opening them.

Improved again for JADE 0.2.0. Please send your real name to creator(at)ancientdomainsofmystery.com for it to be included in the credits. (If you were already asked to do so you can ignore this message. Please include a reference to the bug or RFE you are credited for.)

Implemented.