Updated docstring and error message

Author: JensBlack

app.py

@@ -46,7 +46,7 @@ def run(self):
             try:
                 all_frames = stream_manager.get_frames()
             except MissingFrameError as e:
-                """catch missing frame, stop Thread and raise it again"""
+                """catch missing frame, stop Thread and save what can be saved"""
                 print(*e.args, '\nShutting down DLStream and saving data...')
                 stream_manager.finish_streaming()
                 stream_manager.stop_cameras()

utils/generic.py

@@ -83,7 +83,8 @@ def get_frames(self) -> tuple:
         if ret:
             color_frames[self._camera_name] = image
         else:
-            raise MissingFrameError('No frame was received from the camera.')
+            raise MissingFrameError('No frame was received from the camera. Make sure that the camera is connected '
+                                    'and that the camera source is set correctly.')
 
         return color_frames, depth_maps, infra_frames