Clean things up

src/taste-concurrency_view.adb

@@ -354,7 +354,7 @@ package body TASTE.Concurrency_View is
                   end if;
                end;
             end loop;
-            if Trig_Sys and File_Sys /= "" then
+            if Trig_Sys and File_Sys /= "" and Nodes /= "" then
                Put_Info ("Generating system concurrency view");
                Set_Sys := +Assoc ("Nodes",       Nodes)
                  & Assoc ("Node_Names",          Node_Names)

templates/concurrency_view/aadl_2_threads/filenode.tmplt

@@ -4,4 +4,3 @@
 @@-- The content of this file is generated from node.tmplt
 @@-- If there is no string defined here, no file will be generated per node,
 @@-- (that's an option if the intent is to generate only one file per system)
-@_LOWER:Node_Name_@.aadl

templates/concurrency_view/ada_basic_body/trigger.tmplt

-TRUE
+FALSE

templates/concurrency_view/ada_basic_source/trigger.tmplt

-TRUE
+FALSE