[fdo-trac] #342: Add a "(null)" string constant to FdoStringP

[FDO]

#342: Add a "(null)" string constant to FdoStringP
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   Reporter:  trevorwekel  |       Owner:  trevorwekel
       Type:  enhancement  |      Status:  new        
   Priority:  trivial      |   Milestone:             
  Component:  FDO API      |     Version:  3.3.0      
   Severity:  4            |    Keywords:             
External_id:               |  
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 Add a "(null)" string constant to FdoStringP.  For some use cases, the
 empty string "" is a valid string value.  In these cases, "(null)" can be
 use to define an invalid or uninitialized result.

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Ticket URL: <http://trac.osgeo.org/fdo/ticket/342>
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