Catch another possible exception.

src/data/streams/empatica_zip/container.py

@@ -136,8 +136,9 @@ def patch_ibi_with_bvp(ibi_data, bvp_data):
     # Begin with the cr-features part
     try:
         ibi_data, ibi_start_timestamp = empatica2d_to_array(ibi_data_file)
-    except IndexError as e:
+    except (IndexError, KeyError) as e:
         # Checks whether IBI.csv is empty
+        # It may raise a KeyError if df is empty here: startTimeStamp = df.time[0]
         df_test = pd.read_csv(ibi_data_file, names=['timings', 'inter_beat_interval'], header=None)
         if df_test.empty:
             df_test['timestamp'] = df_test['timings']