Hi, I've just got some lights similar to those, I think the problem lies as you are already aware that the sidelight uses a led rather than a bulb, so in theory all you need to do is trick it into thinking the bulb is still there i.e. with a resistor. You have to be careful here as the resistor can become very hot, so a calculation is required,(ohms law), as to what size resistor is required, and with it being an led as opposed to a bulb the resistor should go in series rather than in parallel.
I could be wrong here as I only picked mine up yesterday and haven't had time to fit until next week.
Either way it can be sorted I'm sure, and worse case scenario I think that you may just have to wire a bulb holder in behind the light fitting off of the sidelight led and put the sidelight bulb in making the computer think it's still connected and ok.
It will be late next week when I fit mine, so should be able to assist more once I get a proper look, you may have sorted before and if you do please share your findings, as it helps others.
Are you wiring them so they come on when you lock/unlock car as well? should be nice when complete, they certainly look good fitted.