another minor bug fixed

mlair/run_modules/pre_processing.py

@@ -137,7 +137,7 @@ class PreProcessing(RunEnvironment):
         if percentiles is None:
             percentiles = [.05, .1, .25, .5, .75, .9, .95]
         df_descr = df.iloc[:-ignore_last_lines].astype('float32').describe(
-            percentiles=percentiles).astype('int32')
+            percentiles=percentiles).astype("int32", errors="ignore")
         df_descr = pd.concat([df.loc[['# Samples']], df_descr]).T
         df_descr.rename(columns={"# Samples": "no. samples", "count": "no. stations"}, inplace=True)
         df_descr_colnames = list(df_descr.columns)