Fix formatting

Author: RalfG

im2deep/calibration.py

@@ -332,7 +332,11 @@ def get_charge(pf):
         # Extract CCS from metadata if it's not a direct column
         if "CCS" not in target_work.columns and "metadata" in target_work.columns:
             target_work["CCS"] = target_work["metadata"].apply(
-                lambda x: float(x.get("CCS")) if isinstance(x, dict) and x.get("CCS") is not None else np.nan
+                lambda x: (
+                    float(x.get("CCS"))  # type: ignore[union-attr]
+                    if isinstance(x, dict) and x.get("CCS") is not None
+                    else np.nan
+                )
             )
 
         source_work["peptide_key"] = source_work["peptidoform"].apply(get_peptide_key)