For the cases where url zoom is below 0, the deep zoom should be serving the image last loaded from tile server at url zoom 0

[shoolpani]

Ideally, if we are zooming out and we dont have image available in the tiling server,

• we should be able to use the last rendered tile image and just resize it to the lower zoom
• As it is zoom out , we dont have to worry about the image resolutions, as we already have one with better resolution at higher zoom
• I have also tried with setting minNativeZoom and minZoom and even that doesnt work.
• leaflet deepzoom is not able to handle this scenario, it throws error in console saying x of undefined and then error is shown in the map.