LunarLambert not compatible with normalmapped models

[fyr02]

Describe the bug In Celestia, it's possible to apply a normalmap to a .cmod model, and it's possible to apply LunarLambert to a model, but it's not possible to do both simultaneously (the normal map takes precedence over the LunarLambert, and the modeled object displays as if no LunarLambert has been defined at all).

To Reproduce Steps to reproduce the behavior: Add an object with a normalmapped cmod model (such as in cubicApocalypse's Salib-3 addon), and change the ssc code to define a LunarLambert for the modeled object.

Expected behavior Both the LunarLambert and the normal map should be displayed correctly on the model.

Desktop (please complete the following information):

• tested and happens on 1.6.2/1.7.0 win, but I suspect that this is a bug that affects all versions