Resolve "Visualize PG"

Closes #27 (closed)

b_asic/operation.py

@@ -193,6 +193,7 @@ class Operation(GraphComponent, SignalSourceProvider):
         """
         raise NotImplementedError
 
+
 class AbstractOperation(Operation, AbstractGraphComponent):
     """Generic abstract operation class which most implementations will derive from.
     TODO: More info.