LoginSerializer allow_blank fix

Author: philippeluickx

rest_auth/serializers.py

@@ -15,8 +15,8 @@
 
 
 class LoginSerializer(serializers.Serializer):
-    username = serializers.CharField(required=False)
-    email = serializers.EmailField(required=False)
+    username = serializers.CharField(required=False, allow_blank=True)
+    email = serializers.EmailField(required=False, allow_blank=True)
     password = serializers.CharField(style={'input_type': 'password'})
 
     def validate(self, attrs):