add blank material files

gearbox/pbr/op4ctf.wad/+ba_oldmed/+ba_oldmed.mat

@@ -0,0 +1,8 @@
+
+{
+"for" "+0ba_oldmed"
+//"basecolor_map" "+0ba_oldmed.png"
+//"normal_map" "+0ba_oldmed_normal.png"
+//"metal_map" "+0ba_oldmed_metal.png"
+//"roughness_map" "+0ba_oldmed_roughness.png"
+}