tools: fix replay/camera.py crash (#21881)

* check array size before reshape

* revert

* check length directly
old-commit-hash: d90188a14e

tools/replay/camera.py

@@ -66,6 +66,7 @@ def ui_thread(addr, frame_address):
         flags=cv2.WARP_INVERSE_MAP)
     else:
       # actually RGB
+      if len(yuv_img) != 0:
         img = np.frombuffer(yuv_img, dtype=np.uint8).reshape((_FULL_FRAME_SIZE[1], _FULL_FRAME_SIZE[0], 3))
         img = img[:, :, ::-1]  # Convert BGR to RGB