The dropDatabase command returns

{ "ok" : 1}

even when dropping a database that does not exist.

Changing the ok result would be a significant breaking change, but it would be helpful to return some detail to confirm whether the command succeeded AND a database was dropped.

The drop command returns an errmsg when attempting to drop a non-existent collection:

> db.runCommand({'drop': 'foo'})
{
	"ok" : 0,
	"errmsg" : "ns not found",
	"code" : 26,
	"codeName" : "NamespaceNotFound"
}