Description: 

When a locator map is placed in an item frame, it causes a marker to appear on a map. This marker is removed if item frame is destroyed by hand, but it stays if the item frame is cleared using commands or structure blocks. The marker that remains is now impossible to remove. 

Steps To Reproduce: 

1. Create a map in creative and place it in an item frame so that it displays a marker
2. Stand directly in front of the item frame and run the command /setblock ~~~ air to clear the block that the frame is in
3. Hold the map again and notice that the marker is still on it, but the frame not longer exists, so there is now no way to remove the marker

Expected Results: The marker should disappear when the block containing the item frame with the map marker is filled or cleared.