patch for KService

[Jens Herden]

Hello,

I propose the attached patch for KService. 
The background is that KService::icon() does not what the docs say:

  /**
   * Returns the name of the icon.
   * @return the icon associated with the service,
   *         or QString::null if not set
   */

Actually the return value is the string "unknown" when the icon is not set in 
the .desktop file. The consequence is that eg. in KBabel all validation tools 
get the "unkown" icon in the menu. 

OK to commit?

Jens
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