some fixes and improvements

python_app/gui/controllers/app_window_pipeline_mixin.py

@@ -355,7 +355,8 @@ class AppWindowPipelineMixin:
 
     def _read_all_raw(self) -> SweepCollection | None:
         """Read available raw collections from raw ring."""
-        assert self._raw_reader is not None
+        if self._raw_reader is None:
+            raise RuntimeError("Raw ring reader is not initialised")
         latest: SweepCollection | None = None
         for _ in range(self._max_pop_per_poll):
             collection = self._raw_reader.pop_raw_collection()
@@ -388,7 +389,8 @@ class AppWindowPipelineMixin:
 
     def _read_all_results(self) -> ResultCollection | None:
         """Read available result collections from results ring."""
-        assert self._result_reader is not None
+        if self._result_reader is None:
+            raise RuntimeError("Result ring reader is not initialised")
         latest: ResultCollection | None = None
         for _ in range(self._max_pop_per_poll):
             collection = self._result_reader.pop_result_collection()