Merge pull request #1025 from luxonis/fix-nnet-callbacks

Check if visualizer is enabled before trying to set frame_shape

Author: zrezke

depthai_sdk/src/depthai_sdk/oak_outputs/xout/xout_nn.py

@@ -99,7 +99,8 @@ def on_callback(self, packet: Union[DetectionPacket, TrackerPacket]):
         if self._frame_shape is None:
             # Lazy-load the frame shape
             self._frame_shape = np.array([packet.frame.shape[0], packet.frame.shape[1]])
-            self._visualizer.frame_shape = self._frame_shape
+            if self._visualizer:
+                self._visualizer.frame_shape = self._frame_shape
 
         bbox = BoundingBox().resize_to_aspect_ratio(packet.frame.shape, self._nn_size, self._resize_mode)