--- a/dataimport/csv.py	Tue Jun 28 15:02:04 2016 +0200
+++ b/dataimport/csv.py	Tue Jul 19 18:08:06 2016 +0200
@@ -34,6 +34,7 @@
     else:
         f = stream_or_filename
         f.seek(0)
+    i = 0  # useful is f is an empty file
     for i, line in enumerate(f):
         pass
     f.seek(0)