Removed crash, when fbx has no material. Added rotation + offset to physx boxes

core/entity.jai

@@ -162,6 +162,11 @@ get_node_world_position :: (e: *Entity, node_name: string) -> Vector3 {
 }
 
 load_model_into_entity :: (e: *Entity, handle: Model_Handle) {
+    if handle == 0 {
+        log_error("MODEL: Attempted to load model into entity of type %, but the model handle is zero. This probably means that the model has not been loaded properly.\n", e.type);
+        return;
+    }
+
     model := get_model_by_handle(handle);
 
     e.renderable.type = .MODEL;