MgMap fails to initialize properly from linked tile set if both coordinate systems match

[jng]

When attempting to view a Map Definition that is linked to a tile set in the AJAX Viewer, the viewer will fail to losd due to a null map extent.

The reason we have a null map extent is because when we initialize an MgMap from a Map Definition that links to a tile set, if both coordinate systems are the same, we are forgetting to set the map/data extents and center members, which results in a null map extent when retrieved