... continuation from the previous commit (I hit enter accidentally)

- added templateError() imported function 
  to be used inside templates to report an "unexpected template error", 
  usage is like this:
  
  match arg
  case pattern  then << a template ... >>
  case pattern2 then << a template ... >>
  else templateError("unknown case in this template")

  templates still won't fail, 
  but the call to the template invoking functions tplNoret() and tplStringX() 
  will fail when an error is reported during the template processing
  


git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@8233 f25d12d1-65f4-0310-ae8a-bbce733d8d8e

Compiler/Template/Tpl.mo

@@ -1550,6 +1550,7 @@ public function tplString
     replaceable type Type_a subtypeof Any;
   end Tpl_Fun;  
   replaceable type Type_a subtypeof Any;   
+
 protected
   Text txt;
   Integer nErr;