[mapguide][MG57][New] Missing check for null FeatureTypeStyle in legend image code

[Traian Stanev]

You can view the artifact detail at the following URL:

    https://mapguide.osgeo.org/servlets/Scarab/id/MG57

Type
 Defect

Artifact ID
 MG57 (Missing check for null FeatureTypeStyle in legend image code)

Reported by
 Traian Stanev
 traianstanev (traian.stanev at autodesk.com)

New artifact details:
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- Resolution set to new value
  Submitted
- Summary set to new value
  Missing check for null FeatureTypeStyle in legend image code
- Operating system set to new value
  All
- Description set to new value
  There was a call to determine the type of a feature type style that assumed the Mdf FeatureTypeStyle object is not null, when in some cases it could be. 
- Artifact Status set to new value
  New
- Defect Severity set to new value
  High
- Platform set to new value
  All
- Component set to new value
  Server
- Priority set to new value
  P2
- Subcomponent set to new value
  Mapping Service
- Artifact created
- Resolution Description set to new value
  I removed the call since it was not needed -- it was part of a TODO.

Also enabled legend images for raster layers, which was part of the same TODO.
- Target milestone set to new value
  1.0.0
- Steps to Reproduce set to new value
  Tom Fukushima has a layer (from Oracle) with no feature type styles, which was causing the crash.
- Version set to new value
  1.0.0

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