Can we constrain LiQL WHERE field != '' or empty or null or what have you?
I know that the constraints on LiQL queries are pretty limited but is there a way to search for something you wear that thing is not empty or "" or null or undefined? For example: SELECT subject ...
To expand on that a little, if you look at each constraint here messages (khoros.com) each one has a different list of supported operators.
So, for example author.id you can use !=
But subject you can't
