Initializes a new plot object with the last available frame.

def initialize_plot(self, ranges=None, plot=None, plots=None, source=None):
        """
        Initializes a new plot object with the last available frame.
        """
        # Get element key and ranges for frame
        element = self.hmap.last
        key = self.keys[-1]
        self.current_frame = element
        self.current_key = key

        data, _, _ = self.get_data(element, ranges, {})
        div = BkDiv(text=data, width=self.width, height=self.height)
        self.handles['plot'] = div
        self._execute_hooks(element)
        self.drawn = True
        return div