More improvements to Infrastructure

• Renamed MPI_Call to MPICall
  • in Python it is a good practice to use CamelCase for class names
• fix instruction block generating if for empty branch
• InstructionBlock returns empty list instead of exception when qurey for empty branch
• TemplateManager can now insert blocks before or after given one

scripts/Infrastructure/InstructionBlock.py

@@ -98,11 +98,11 @@ class InstructionBlock:
                         result_str += str(op) + "\n"
                     result_str += "}\n"
             else:
-                assert len(val) > 0
-                result_str += "if (rank == %d) {\n" % int(key)
-                for op in val:
-                    result_str += str(op) + "\n"
-                result_str += "}\n"
+                if len(val) > 0:
+                    result_str += "if (rank == %d) {\n" % int(key)
+                    for op in val:
+                        result_str += str(op) + "\n"
+                    result_str += "}\n"
 
         return result_str