Fix material data ref

Sources/arm/io/ImportBlend.hx

@@ -191,7 +191,7 @@ class ImportBlend {
 
 			for (mat in mats) {
 				// Material slot
-				Context.material = new MaterialSlot();
+				Context.material = new MaterialSlot(Project.materials[0].data);
 				Project.materials.push(Context.material);
 				UINodes.inst.updateCanvasMap();
 				var nodes = UINodes.inst.nodes;

Sources/arm/io/ImportFolder.hx

@@ -97,7 +97,7 @@ class ImportFolder {
 			});
 		}
 		else {
-			Context.material = new MaterialSlot();
+			Context.material = new MaterialSlot(Project.materials[0].data);
 			Project.materials.push(Context.material);
 		}
 		UINodes.inst.updateCanvasMap();

Sources/arm/util/Path.hx

@@ -71,8 +71,7 @@ class Path {
 	public static function checkOpacTex(p:String):Bool {
 		return p.endsWith("_opac") ||
 			   p.endsWith("_alpha") ||
-			   p.endsWith("_opacity") ||
-			   p.endsWith("_mask");
+			   p.endsWith("_opacity");
 	}
 
 	public static function checkNorTex(p:String):Bool {