FIX: maintain return type stability in win32InstalledFonts

tacaswell · tacaswell · commit 2891f55ba42c · 2018-09-19T11:00:48.000-04:00
closes #12173
diff --git a/lib/matplotlib/font_manager.py b/lib/matplotlib/font_manager.py
@@ -207,7 +207,7 @@ def win32InstalledFonts(directory=None, fontext='ttf'):
                 return list(items)
         except (OSError, MemoryError):
             continue
-    return None
+    return []
 
 
 def OSXInstalledFonts(directories=None, fontext='ttf'):
