fixed issue #1

Author: daimor

sqlalchemy_iris/base.py

@@ -1208,10 +1208,7 @@ def get_columns(self, connection, table_name, schema=None, **kw):
                 }
             cols.append(cdict)
 
-        if cols:
-            return cols
-
-        return None
+        return cols
 
     @reflection.cache
     def get_view_names(self, connection, schema=None, **kw):