Fix is_photodiode

Author: bjhardcastle

src/npc_sessions/sessions.py

@@ -1997,7 +1997,7 @@ def is_photodiode(self) -> bool:
         """
         if not self.is_task:
             raise AttributeError(f"{self.id} is not a session with behavior task")
-        task_frame_times = next(v for k,v in self.stim_frame_times if self.task_stim_name in k)
+        task_frame_times = next(v for k,v in self.stim_frame_times.items() if self.task_stim_name in k)
         return any(np.array_equal(task_frame_times, array) for array in self.sync_data.constant_lag_frame_display_time_blocks)