There were two issues fixed here. First, I broke the material inspector with my changes at 53188a12da which added support for hiding entire property groups. I'm not sure how this happened because I definitely tested the MaterialComponent's material inspector. Perhaps there was a bad merge or something otherwise got clobbered after testing and before committing. Anyway, this issue was I accidentally delete the code that prepared the list of material properties for functor processing.
The second issue was the MaterialFunctor class needs to return null when metadata can't be found; it was proceeding to dereference an end iterator.
Testing:
Successfully opened the material inspector through the MaterialComponent. Was able to change property flags in the inspector and see other properties change visibility as expected.
Chris Santora
bffc72794b