fix: Issue with resonator spectroscopy at low power addressed

src/qibocal/protocols/characterization/resonator_spectroscopy.py

@@ -1,4 +1,4 @@
-from dataclasses import dataclass, field
+from dataclasses import dataclass, field, fields
 from typing import Optional, Union
 
 import numpy as np
@@ -82,6 +82,14 @@ class ResonatorSpectroscopyResults(Results):
     )
     """Readout attenuation [dB] for each qubit."""
 
+    def __contains__(self, key: QubitId):
+        return all(
+            key in getattr(self, field.name)
+            for field in fields(self)
+            if isinstance(getattr(self, field.name), dict)
+            and field.name != "bare_frequency"
+        )
+
 
 @dataclass
 class ResonatorSpectroscopyData(Data):