add blank material files

gearbox/pbr/models/w_m40a1clip.mdl/w_m40a1clip.mdl.mat

@@ -0,0 +1,8 @@
+
+{
+"for" "#models/w_m40a1clip/sniper_ammo.mdl"
+//"basecolor_map" "sniper_ammo.png"
+//"normal_map" "sniper_ammo_normal.png"
+//"metal_map" "sniper_ammo_metal.png"
+//"roughness_map" "sniper_ammo_roughness.png"
+}