add blank material files

bshift/pbr/models/metalplategibs_dark.mdl/metalplategibs_dark.mdl.mat

@@ -0,0 +1,16 @@
+
+{
+"for" "#models/metalplategibs_dark/metal1.mdl"
+//"basecolor_map" "metal1.png"
+//"normal_map" "metal1_normal.png"
+//"metal_map" "metal1_metal.png"
+//"roughness_map" "metal1_roughness.png"
+}
+
+{
+"for" "#models/metalplategibs_dark/metal2.mdl"
+//"basecolor_map" "metal2.png"
+//"normal_map" "metal2_normal.png"
+//"metal_map" "metal2_metal.png"
+//"roughness_map" "metal2_roughness.png"
+}