Fix lint in controlled circuit and Instruction.definition change (qiskit-community/qiskit-aqua#1100)

* Fix lint in controlled circuit

* Fixed change to Instruction.definition

Author: manoelmarques

qiskit/aqua/operators/primitive_ops/circuit_op.py

@@ -223,7 +223,8 @@ def reduce(self) -> OperatorBase:
                 # Check if Identity or empty instruction (need to check that type is exactly
                 # Instruction because some gates have lazy gate.definition population)
                 # pylint: disable=unidiomatic-typecheck
-                if isinstance(gate, IGate) or (type(gate) == Instruction and gate.definition == []):
+                if isinstance(gate, IGate) or (type(gate) == Instruction and
+                                               gate.definition.data == []):
                     del self.primitive.data[i]  # type: ignore
         return self
 

qiskit/aqua/operators/state_fns/circuit_state_fn.py

@@ -349,7 +349,8 @@ def reduce(self) -> OperatorBase:
                 # Check if Identity or empty instruction (need to check that type is exactly
                 # Instruction because some gates have lazy gate.definition population)
                 # pylint: disable=unidiomatic-typecheck
-                if isinstance(gate, IGate) or (type(gate) == Instruction and gate.definition == []):
+                if isinstance(gate, IGate) or (type(gate) == Instruction and
+                                               gate.definition.data == []):
                     del self.primitive.data[i]
         return self