[Mapguide-trac] [mapguide-trac] #2738: Error "Null reference. No data from renderer" when GETDYNAMICMAPOVERLAYIMAGE is called without FORMAT parameter

[MapGuide Open Source]

#2738: Error "Null reference. No data from renderer" when
GETDYNAMICMAPOVERLAYIMAGE is called without FORMAT parameter
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   Reporter:  jng        |      Owner:  jng
       Type:  defect     |     Status:  new
   Priority:  low        |  Milestone:  3.1
  Component:  Map Agent  |    Version:
   Severity:  trivial    |   Keywords:
External ID:             |
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 `FORMAT` is a required parameter for `GETDYNAMICMAPOVERLAYIMAGE`

 So when this parameter is missing, we should throw immediately instead of
 proceeding ahead, which results in a cryptic error down the road: `Null
 reference. No data from renderer`

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Ticket URL: <https://trac.osgeo.org/mapguide/ticket/2738>
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