From cf8e5e3cf5b0e1be05a611c8828690acfcd2b9fa Mon Sep 17 00:00:00 2001
From: donkopotamus <derek.harland@finq.co.nz>
Date: Fri, 17 Jan 2014 11:00:24 +1300
Subject: Bug Fix: Stop generating bad sql if an empty UniqueConstraint() is
 given

---
 lib/sqlalchemy/sql/compiler.py | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib/sqlalchemy/sql/compiler.py')

diff --git a/lib/sqlalchemy/sql/compiler.py b/lib/sqlalchemy/sql/compiler.py
index ade3c623a..5c5bfad55 100644
--- a/lib/sqlalchemy/sql/compiler.py
+++ b/lib/sqlalchemy/sql/compiler.py
@@ -2511,6 +2511,8 @@ class DDLCompiler(Compiled):
         return preparer.format_table(table)
 
     def visit_unique_constraint(self, constraint):
+        if len(constraint) == 0:
+            return ''
         text = ""
         if constraint.name is not None:
             text += "CONSTRAINT %s " % \
-- 
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