!video fixes

Author: jonathanhogg

.flake8

@@ -1,4 +1,3 @@
 [flake8]
 max_line_length = 160
-max_complexity = 30
-
+max_complexity = 35

src/flitter/cache.py

@@ -254,7 +254,8 @@ def read_video_frames(self, obj, position, loop=False, back_and_forth=False, tri
         if container is not None:
             if position is None:
                 logger.debug("Closing video: {}", self._path)
-                decoder.close()
+                if decoder is not None:
+                    decoder.close()
                 container.close()
                 container = decoder = None
                 frames = []

src/flitter/render/window/video.py

@@ -67,7 +67,9 @@ def render(self, node, references, **kwargs):
             self._frame0 = None
             self._frame1 = None
         if frame0 is None:
-            self.framebuffer.clear()
+            if self._target is not None:
+                self._target.release()
+                self._target = None
             return
         frame_size = frame0.width, frame0.height
         if self._frame0_texture is None: