manager: use csv-dialect that's been detected

chrono/manager/forms.py

@@ -72,6 +72,7 @@ class ImportEventsForm(forms.Form):
             help_text=_('CSV file with date, time, number of places, '
                         'number of places in waiting list, and label '
                         'as columns.'))
+    events = None
 
     def clean_events_csv_file(self):
         content = self.cleaned_data['events_csv_file'].read()
@@ -80,11 +81,11 @@ class ImportEventsForm(forms.Form):
 
         try:
             dialect = csv.Sniffer().sniff(content)
-        except Exception:
+        except csv.Error:
             dialect = None
 
         events = []
-        for i, csvline in enumerate(csv.reader(content.splitlines())):
+        for i, csvline in enumerate(csv.reader(content.splitlines(), dialect=dialect)):
             if not csvline:
                 continue
             if len(csvline) < 2: