Fix bug when reading concentration values from dataset

scripts/src/Dataset.py

@@ -83,4 +83,4 @@ class Dataset:
     
 
     def get_concentration_values(self) -> list[float]:
-        return [m.concentrationValue for m in self.measurements if m.concentrationValue]
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+        return [m.concentrationValue for m in self.measurements if m.concentrationValue is not None]
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