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

@@ -159,7 +159,6 @@ class InstructionBlock:
             self.operations[kind] = op
         else:
             as_int = int(index)  # will Raise ValueError if not integer
-            print(op)
             if not isinstance(op, Instruction):
                 raise ValueError('Provide Instruction')
             if len(self.operations[kind]) < as_int: