Redline doesn't work with commercial layers

[liuar]

1. Open a Map with Google Street Map
   
2. Click Redline
   

Result: Error - Invalid argument supplied for foreach()
Expected: Work normally like without commercial layers

[liuar]

The original logic to find the top most map name has a potential issue: since commercial layers have lots of limitation, if maps[maps.length - 1] is a commercial layer, then following steps to deal with normal maps will get into trouble.

In the patch I replace the implementation with

this.getMapLayer().getMapName();

to get current map's name, which can guarantee the map is not a commercial layer.

[liuar]

Hi Jackie,

Would you please review the patch and check if the new logic is right?

Regards,
Arthur

[jng]

Patch looks fine

[liuar]

Thanks.