         preconditionFailure("loadCell must be overridden")
     }
 
-// MARK: useful functions
+    // MARK: useful functions
 
     /**
      * Called when a cell is tapped on. Consider implementing `CellBrowser` if

    open func getCellsPerRow() -> Int {
        return cellsPerRow
    }
    
    /**
     * Return an error message to be displayed when no content is available
     */
    open func getErrorMessage() -> String {
        return "No content"
    }
    
    /**
     * Use to display anything you need when no content is available.
     * Alternatively just override `getErrorMessage` for a simple way of

        text.removeFromSuperview()
        errorText = nil
    }

    /**
     * Call this to load new images. Optionally specify a `CellBrowser` if you
     * wish to be notified via `CellBrowser.imagesLoaded()` when new images have
