[mapguide-trac] #842: Null pointer checks needed for GetExtent

[MapGuide Open Source]

#842: Null pointer checks needed for GetExtent
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   Reporter:  tomfukushima  |       Owner:       
       Type:  defect        |      Status:  new  
   Priority:  medium        |   Milestone:  2.1  
  Component:  Web API       |     Version:  2.0.1
   Severity:  minor         |    Keywords:       
External_id:                |  
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 Calling GetExtent on an empty SDF will result in null pointer exceptions.
 These changes change the behavior of the API so that instead of getting a
 fatal exception, we get NULL back from the call.

 Note that this fix changes the behavior of the GetExtent API in that
 instead of throwing an exception, NULL is returned.

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Ticket URL: <http://trac.osgeo.org/mapguide/ticket/842>
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