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/dialects/mssql/base.py | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib/sqlalchemy/dialects/mssql')

diff --git a/lib/sqlalchemy/dialects/mssql/base.py b/lib/sqlalchemy/dialects/mssql/base.py
index c024b6230..6c942b270 100644
--- a/lib/sqlalchemy/dialects/mssql/base.py
+++ b/lib/sqlalchemy/dialects/mssql/base.py
@@ -1069,6 +1069,8 @@ class MSDDLCompiler(compiler.DDLCompiler):
         return text
 
     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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