Merge pull request #515 from yprez/blank_fields_issue

Fix for #514

rest_framework/serializers.py

@@ -441,7 +441,7 @@ class ModelSerializer(Serializer):
 
         kwargs['blank'] = model_field.blank
 
-        if model_field.null:
+        if model_field.null or model_field.blank:
             kwargs['required'] = False
 
         if model_field.has_default():

rest_framework/tests/serializer.py

@@ -751,6 +751,10 @@ class BlankFieldTests(TestCase):
         serializer = self.not_blank_model_serializer_class(data=self.data)
         self.assertEquals(serializer.is_valid(), False)
 
+    def test_create_model_null_field(self):
+        serializer = self.model_serializer_class(data={})
+        self.assertEquals(serializer.is_valid(), True)
+
 
 #test for issue #460
 class SerializerPickleTests(TestCase):