[OpenLayers-Trac] [OpenLayers] #2840: symbolizers should not have null default values

[OpenLayers]

#2840: symbolizers should not have null default values
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 Reporter:  tschaub  |       Owner:              
     Type:  feature  |      Status:  new         
 Priority:  minor    |   Milestone:  2.11 Release
Component:  general  |     Version:  2.10        
 Keywords:           |       State:              
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 Because OpenLayers.Util.extend treats {{{null}}} as a value to be applied
 to the target, there is a difference between {{{null}}} and
 {{{undefined}}} as default values.  We get into trouble when defaults are
 assumed too early with symbolizers.  We could set default values to
 {{{undefined}}}.  The (small) benefit of this would be that the symbolizer
 properties would be enumerable.  However, we can save a few bytes by not
 including any defaults and I don't think we lose anything by not being
 able to enumerate over the properties.

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Ticket URL: <http://trac.openlayers.org/ticket/2840>
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