add blank material files

valve/pbr/halflife.wad/+SIGN42A/+SIGN42A.mat

@@ -0,0 +1,16 @@
+
+{
+"for" "+0SIGN42A"
+//"basecolor_map" "+0SIGN42A.png"
+//"normal_map" "+0SIGN42A_normal.png"
+//"metal_map" "+0SIGN42A_metal.png"
+//"roughness_map" "+0SIGN42A_roughness.png"
+}
+
+{
+"for" "+ASIGN42A"
+//"basecolor_map" "+ASIGN42A.png"
+//"normal_map" "+ASIGN42A_normal.png"
+//"metal_map" "+ASIGN42A_metal.png"
+//"roughness_map" "+ASIGN42A_roughness.png"
+}