fix: dimensions in data handler if no buffer is used

apps/hiopy/_data_handler.py

@@ -47,7 +47,7 @@ class DataHandler:
             self.buf[self.t % self.time_chunk_size, ...] = np.transpose(event.data)
             event.release()
         else:
-            self.buf = np.transpose(event.data)
+            self.buf = np.squeeze(np.transpose(event.data))[None, ...]
         self.t += 1
         if self.t % self.time_chunk_size == 0 or not self.use_buffer:  # chunk complete
             self.flush()