From dbce2618b1c6dcd76a5ae68ee0bc4464b8faecb3 Mon Sep 17 00:00:00 2001
From: Andrew McNamara <andrewm@object-craft.com.au>
Date: Mon, 10 Jan 2005 23:17:35 +0000
Subject: [PATCH] Only set error string when dict lookup found no matching key
 (was setting it for all failures, potentially masking other exceptions).

---
 Modules/_csv.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Modules/_csv.c b/Modules/_csv.c
index 7eb1e2275f9..9f715e41d6b 100644
--- a/Modules/_csv.c
+++ b/Modules/_csv.c
@@ -127,9 +127,12 @@ get_dialect_from_registry(PyObject * name_obj)
         PyObject *dialect_obj;
 
         dialect_obj = PyDict_GetItem(dialects, name_obj);
-        if (dialect_obj == NULL)
-            return PyErr_Format(error_obj, "unknown dialect");
-        Py_INCREF(dialect_obj);
+	if (dialect_obj == NULL) {
+		if (!PyErr_Occurred())
+			PyErr_Format(error_obj, "unknown dialect");
+	}
+	else
+		Py_INCREF(dialect_obj);
         return dialect_obj;
 }