Prevent crash when duplicating object which doesn't have evaluated base properties yet

This mainly happens when copy on write is enabled.

source/blender/blenkernel/intern/collection.c

@@ -260,6 +260,9 @@ void BKE_collection_object_add_from(Scene *scene, Object *ob_src, Object *ob_dst
 
 	for (SceneLayer *sl = scene->render_layers.first; sl; sl = sl->next) {
 		Base *base_src = BKE_scene_layer_base_find(sl, ob_src);
+		if (base_src->collection_properties == NULL) {
+			continue;
+		}
 		if (base_src != NULL) {
 			Base *base_dst = BKE_scene_layer_base_find(sl, ob_dst);
 			IDP_MergeGroup(base_dst->collection_properties, base_src->collection_properties, true);