Fixed unitialized parameter in instances_path stylesheet, leading to
calls to add_instance with no data when passing datatypes insteatd of project
root. That bug was making exceptions (for exemple when editing type) when
having arrays of derivated types in project.

     1

#State Text Reference;;;;;;;

     2

#Reference Number;Text 1;Text 2;Text 3;Text 4;Text 5;...;Text n