Ensure Animation.save(writer=...) parameter is correct type

Author: QuLogic

lib/matplotlib/animation.py

@@ -1019,6 +1019,7 @@ def func(current_frame: int, total_frames: int) -> Any
         for anim in all_anim:
             anim._draw_was_started = True
 
+        _api.check_isinstance((str, AbstractMovieWriter, None), writer=writer)
         if writer is None:
             writer = mpl.rcParams['animation.writer']
         elif (not isinstance(writer, str) and