Apply suggestion to km3io/offline.py

km3io/offline.py

@@ -537,7 +537,7 @@ class OfflineReader:
 
             yield trk_index, stages_index
 
-    def _find_empty(self, chunk_arr):
+    def _find_empty(self, array):
         """finds empty lists/arrays in a chunked-jagged array of data
         of interest.