From f3b69f9757ec03057441ebbd52b7cdbfed31fb32 Mon Sep 17 00:00:00 2001
From: Claude Paroz <claude@2xlibre.net>
Date: Fri, 30 Mar 2018 11:55:33 +0200
Subject: Fixed #29273 -- Prevented initial selection of empty choice in
 multiple choice widgets.

Regression in b52c73008a9d67e9ddbb841872dc15cdd3d6ee01.
---
 django/forms/widgets.py | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'django/forms/widgets.py')

diff --git a/django/forms/widgets.py b/django/forms/widgets.py
index 566bdf25d6..e4f8957189 100644
--- a/django/forms/widgets.py
+++ b/django/forms/widgets.py
@@ -649,6 +649,8 @@ class ChoiceWidget(Widget):
 
     def format_value(self, value):
         """Return selected values as a list."""
+        if value is None and self.allow_multiple_selected:
+            return []
         if not isinstance(value, (tuple, list)):
             value = [value]
         return [str(v) if v is not None else '' for v in value]
-- 
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