From 5c90bf9cc00e9870ba1d1d5bd3113ce797e73306 Mon Sep 17 00:00:00 2001
From: Xavier Ordoquy <xordoquy@linovia.com>
Date: Mon, 1 Jun 2015 16:13:35 +0100
Subject: [PATCH] Fix for #2894 thanks to @carljm

---
 rest_framework/fields.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index d8bb0a017..e7a4cee5f 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -1060,7 +1060,11 @@ class MultipleChoiceField(ChoiceField):
         # We override the default field access in order to support
         # lists in HTML forms.
         if html.is_html_input(dictionary):
-            return dictionary.getlist(self.field_name)
+            ret = dictionary.getlist(self.field_name)
+            if getattr(self.root, 'partial', False) and not ret:
+                ret = empty
+            return ret
+
         return dictionary.get(self.field_name, empty)
 
     def to_internal_value(self, data):