PCVL 1149 Fix circuit deserialization with repeated parameters (#718)

Author: Benoit-F-Q

perceval/serialization/deserialize.py

@@ -305,7 +305,7 @@ def __init__(self, m: int, name: str, params: dict):
         if not name:
             name = None
         self._circuit = Circuit(m=m, name=name)
-        self._params = params or dict()
+        self._params = dict() if params is None else params
 
     def add(self, serial_comp):
         component = self.deserialize(serial_comp, self._params)
@@ -346,7 +346,7 @@ class ExperimentBuilder:
 
     def __init__(self, pb_e: pb.Experiment, params: dict):
         self._pb_e = pb_e
-        self._params = params or dict()
+        self._params = dict() if params is None else params
 
     def deserialize_ports(self, experiment, serialized_port_map, location: PortLocation):
         for i, serial_port in sorted(serialized_port_map.items()):  # Sorted needed for the heralds autogenerated names