Partial fix for issue eclipse/aidge/aidge_core#167

Partial fix for issue eclipse/aidge/aidge_core#167:

• Add an assertion in Pop operator.

src/operator/Memorize.cpp

@@ -150,7 +150,7 @@ void Aidge::Memorize_Op::setBackend(const std::string& name, Aidge::DeviceIdx_t
 }
 
 void Aidge::Memorize_Op::forward() {
-    Operator::forward();
+    OperatorTensor::forward();
     ++mAttributes->template getAttr<MemorizeAttr::ForwardStep>();
     mAttributes->template getAttr<MemorizeAttr::ScheduleStep>() = 0;
 }