Improve test coverage

Author: mwaskom

tests/_marks/test_bars.py

@@ -92,3 +92,15 @@ def test_mapped_properties(self):
             assert bar.get_facecolor() == to_rgba(f"C{i}", mark.alpha)
             assert bar.get_edgecolor() == to_rgba(f"C{i}", 1)
         assert ax.patches[0].get_linewidth() < ax.patches[1].get_linewidth()
+
+    def test_zero_height_skipped(self):
+
+        p = Plot(["a", "b", "c"], [1, 0, 2]).add(Bar()).plot()
+        ax = p._figure.axes[0]
+        assert len(ax.patches) == 2
+
+    def test_artist_kws_clip(self):
+
+        p = Plot(["a", "b"], [1, 2]).add(Bar({"clip_on": False})).plot()
+        patch = p._figure.axes[0].patches[0]
+        assert patch.clipbox is None