[mapguide-trac] #1878: Schema report will throw exception when view feature and there is no feature

[MapGuide Open Source]

#1878: Schema report will throw exception when view feature and there is no
feature
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   Reporter:  sparkliu  |       Owner:     
       Type:  defect    |      Status:  new
   Priority:  low       |   Milestone:     
  Component:  General   |     Version:     
   Severity:  trivial   |    Keywords:     
External_id:            |  
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 This is because when there is no feature, COUNT will return a null value.
 We should add check on that.

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Ticket URL: <http://trac.osgeo.org/mapguide/ticket/1878>
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