fix for unicode art of empty skew partition

sagemath · Oct 23, 2019 · 410d40b · 410d40b
1 parent 76b7fdd
commit 410d40b
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/src/sage/combinat/skew_partition.py b/src/sage/combinat/skew_partition.py
@@ -453,11 +453,16 @@ def _unicode_art_(self):
               ┌┐
             ┌┬┴┘
             └┘
+
+        TESTS::
+
+            sage: unicode_art(SkewPartition([[],[]]))
+            ∅
         """
         from sage.typeset.unicode_art import UnicodeArt
         out, inn = self
         inn = inn + [0] * (len(out) - len(inn))
-        if not self._list:
+        if not any(self._list):
             return UnicodeArt(u'∅')
         if self.parent().options.convention == "French":
             s, t, b, l, r, tr, tl, br, bl, x, h = list(u' ┴┬├┤┘└┐┌┼─')