Corrects issue where engine.execute raised exception when given empty list. Fixes #1175.

lib/sqlalchemy/engine/base.py

@@ -873,7 +873,7 @@ class Connection(Connectable):
                 return [{}]
         elif len(multiparams) == 1:
             if isinstance(multiparams[0], (list, tuple)):
-                if isinstance(multiparams[0][0], (list, tuple, dict)):
+                if not multiparams[0] or isinstance(multiparams[0][0], (list, tuple, dict)):
                     return multiparams[0]
                 else:
                     return [multiparams[0]]

test/engine/execute.py

@@ -78,6 +78,13 @@ class ExecuteTest(TestBase):
             except tsa.exc.DBAPIError:
                 assert True
 
+    def test_empty_insert(self):
+        try:
+            result = testing.db.execute(users.insert(), [])
+            assert [] == list(result)
+        except:
+            assert False
+
 class ProxyConnectionTest(TestBase):
     @testing.fails_on('firebird') # Data type unknown
     def test_proxy(self):