fix check for None in hatch argument for stackplot

nbarlowATI · rcomer · web-flow · commit 9daffa3bb2e7 · 2023-10-31T09:10:43.000Z
Co-authored-by: Ruth Comer &lt;10599679+rcomer@users.noreply.github.com&gt;
diff --git a/lib/matplotlib/stackplot.py b/lib/matplotlib/stackplot.py
@@ -85,7 +85,7 @@ def stackplot(axes, x, *args,
     else:
         colors = (axes._get_lines.get_next_color() for _ in y)
 
-    if not hatch or isinstance(hatch, str):
+    if hatch is None or isinstance(hatch, str):
         hatch = itertools.cycle([hatch])
     else:
         hatch = itertools.cycle(hatch)
