Merge pull request #12609 from scarlehoff/fix_12180

Fix to  #12180 (display.Video failing with data=None)

IPython/core/display.py

@@ -1086,7 +1086,7 b' class Video(DisplayObject):'
         if url is None and isinstance(data, str) and data.startswith(('http:', 'https:')):
             url = data
             data = None
-        elif os.path.exists(data):
+        elif data is not None and os.path.exists(data):
             filename = data
             data = None