From 624aee295add8b772757e00be8569082ad6702c0 Mon Sep 17 00:00:00 2001
From: Friedrich Lindenberg <friedrich@pudo.org>
Date: Mon, 24 Dec 2012 22:47:45 +0100
Subject: [PATCH] Handle missing schema...

---
 sqlaload/query.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sqlaload/query.py b/sqlaload/query.py
index 73a4657..5fba4cb 100644
--- a/sqlaload/query.py
+++ b/sqlaload/query.py
@@ -59,14 +59,14 @@ def query(engine, query):
         yield res
 
 def distinct(engine, table, *columns, **kw):
-    columns = [table.c[c] for c in columns]
 
     qargs = []
     try:
+        columns = [table.c[c] for c in columns]
         for col, val in kw.items():
             qargs.append(table.c[col]==val)
     except KeyError:
-        return
+        return []
 
     q = expression.select(columns, distinct=True,
             whereclause=and_(*qargs),