Fix combiner

src/avg/compton_combiner.py

@@ -550,9 +550,11 @@ def save_csv(df: pd.DataFrame, filepath: str, update_current: bool = True):
         df = df_current
 
     # Format columns
-    df['mean_energy'] = df['mean_energy'].map("{:.3f}".format)
+    if 'mean_energy' in df.columns:
+        df['mean_energy'] = df['mean_energy'].map("{:.3f}".format)
     for col in ['mean_energy_stat_err', 'mean_energy_sys_err', 'mean_spread', 'mean_spread_stat_err']:
-        df[col] = df[col].map("{:.4f}".format)
+        if col in df.columns:
+            df[col] = df[col].map("{:.4f}".format)
 
     df.to_csv(filepath, index=False, float_format='%g')
     return