From a3dcb0f309bf8c8036ce844c750053e35244b437 Mon Sep 17 00:00:00 2001
From: Maxime Beauchemin <maximebeauchemin@gmail.com>
Date: Fri, 8 Apr 2016 22:32:12 -0700
Subject: [PATCH] closes #292 (#304)

---
 caravel/forms.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/caravel/forms.py b/caravel/forms.py
index b5ff1db0bf..062427cdb1 100644
--- a/caravel/forms.py
+++ b/caravel/forms.py
@@ -113,7 +113,9 @@ class FormFactory(object):
         viz = self.viz
         datasource = viz.datasource
         default_metric = datasource.metrics_combo[0][0]
-        default_groupby = datasource.groupby_column_names[0]
+
+        gb_cols = datasource.groupby_column_names
+        default_groupby = gb_cols[0] if gb_cols else None
         group_by_choices = [(s, s) for s in datasource.groupby_column_names]
         # Pool of all the fields that can be used in Caravel
         self.field_dict = {