[NF] Fix instantiation of derived classes.

- Fix Typing.typeClass so that it correctly handles the case where the
  root class is a short class definition.

Belonging to [master]:
  - OpenModelica/OMCompiler#2603
  - OpenModelica/OpenModelica-testsuite#1014

Compiler/NFFrontEnd/NFTyping.mo

@@ -179,6 +179,7 @@ function typeClass
   input InstNode cls;
   input String name;
 algorithm
+  typeClassType(cls, NFBinding.EMPTY_BINDING, ExpOrigin.CLASS);
   typeComponents(cls, ExpOrigin.CLASS);
   execStat("NFTyping.typeComponents(" + name + ")");
   typeBindings(cls, cls, ExpOrigin.CLASS);