[GeoJSON] Aligning implementations

[Jason Birch]

Tim Schaub wrote:
> You got me curious about all these people who want to serve up 
> geographic features with no geometry.  I wonder if you just mean null or 
> broken geometry - or if there really is a world where people deal in 
> geography without geometry.

I think that some JSON streams might be mixed, some records containing 
geometry, others not.  We don't want our applications to break when they 
encounter a record without spatial context.

Jason