prj-part.adb (Parse_Single_Project): Call Is_Extending_All (Extended_Project) only if Extended_Project is defined...

2004-10-04  Vincent Celier  <celier@gnat.com>

	* prj-part.adb (Parse_Single_Project): Call Is_Extending_All
	(Extended_Project) only if Extended_Project is defined, to avoid
	assertion error.
	(Post_Parse_Context_Clause): Always call Set_Path_Name_Of with a
	resolved path.
	(Parse_Single_Project): Ditto.

	* prj-env.adb (Set_Ada_Paths.Add.Recursive_Add): Do not call
	Add_To_Project_Path for virtual projects.

From-SVN: r88491