Checking string instead of null

save_load/ui/save_file.gd

@@ -41,9 +41,9 @@ func set_save_date() -> void:
 
 func set_save_icon() -> void:
 	var _icon_texture: Texture2D = ImageTexture.new()
-	if save_file_details.save_icon != null and !FileAccess.file_exists(save_file_details.save_icon):
+	if save_file_details.save_icon != "" and !FileAccess.file_exists(save_file_details.save_icon):
 		return
-	elif save_file_details.save_icon == null:
+	elif save_file_details.save_icon == "":
 		_icon_texture = default_save_icon_resource
 	else:
 		var _icon_image: Image = Image.new()