From f34bb15ebf050bebc9df48345d04f68a65702837 Mon Sep 17 00:00:00 2001
From: ddelange <14880945+ddelange@users.noreply.github.com>
Date: Fri, 20 Dec 2019 01:08:42 +0100
Subject: [PATCH] Fix list of ranges

AttributeError: 'list' object has no attribute 'is_empty'
---
 mixology/union.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mixology/union.py b/mixology/union.py
index b2ae34a..e7931b6 100644
--- a/mixology/union.py
+++ b/mixology/union.py
@@ -20,6 +20,9 @@ def ranges(self):
     def of(cls, *ranges):
         flattened = []
         for constraint in ranges:
+            if isinstance(constraint, list):
+                flattened.extend(constraint)
+
             if constraint.is_empty():
                 continue