TST: Test rendering of 2 empty-ish DataFrames (pandas-dev#15953)

DataFrame with an index but no column, and one with a column but no index.
Add entry to whatsnew.

Author: JimStearns206

doc/source/whatsnew/v0.20.2.txt

@@ -54,6 +54,7 @@ I/O
 ^^^
 
 - Bug that would force importing of the clipboard routines unnecessarily, potentially causing an import error on startup (:issue:`16288`)
+- Bug that raised IndexError HTML-rendering an empty DataFrame (:issue:`15953`)
 
 
 Plotting

pandas/tests/io/formats/test_style.py

@@ -103,11 +103,15 @@ def test_render(self):
         s.render()
         # it worked?
 
-    def test_render_empty_df(self):
+    def test_render_empty_dfs(self):
         empty_df = DataFrame()
         es = Styler(empty_df)
         es.render()
-        # It didn't raise IndexError?
+        # An index but no columns
+        DataFrame(columns=['a']).style.render()
+        # A column but no index
+        DataFrame(index=['a']).style.render()
+        # No IndexError raised?
 
     def test_render_double(self):
         df = pd.DataFrame({"A": [0, 1]})