Added None patch test

Author: Impaler343

lib/matplotlib/axes/_axes.py

@@ -7226,20 +7226,21 @@ def hist(self, x, bins=None, range=None, density=False, weights=None,
         linestyles = itertools.cycle(np.atleast_1d(kwargs.get('linestyle', None)))
 
         for patch, lbl in itertools.zip_longest(patches, labels):
-            p = patch[0]
-            kwargs.update({
-                'hatch': next(hatches),
-                'linewidth': next(linewidths),
-                'linestyle': next(linestyles),
-                'edgecolor': next(edgecolors),
-                'facecolor': next(facecolors),
-            })
-            p._internal_update(kwargs)
-            if lbl is not None:
-                p.set_label(lbl)
-            for p in patch[1:]:
+            if patch:
+                p = patch[0]
+                kwargs.update({
+                    'hatch': next(hatches),
+                    'linewidth': next(linewidths),
+                    'linestyle': next(linestyles),
+                    'edgecolor': next(edgecolors),
+                    'facecolor': next(facecolors),
+                })
                 p._internal_update(kwargs)
-                p.set_label('_nolegend_')
+                if lbl is not None:
+                    p.set_label(lbl)
+                for p in patch[1:]:
+                    p._internal_update(kwargs)
+                    p.set_label('_nolegend_')
 
         if nx == 1:
             return tops[0], bins, patches[0]

lib/matplotlib/tests/test_axes.py

@@ -4672,6 +4672,11 @@ def test_hist_emptydata():
     ax.hist([[], range(10), range(10)], histtype="step")
 
 
+def test_hist_none_patch():
+    x = [[1, 2], [2, 3]]
+    plt.hist(x, label=["First", "Second", "Third"])
+
+
 def test_hist_labels():
     # test singleton labels OK
     fig, ax = plt.subplots()