Fixes from SpikeInterface CI

Author: alejoe91

neo/rawio/axonarawio.py

@@ -302,7 +302,7 @@ def _get_analogsignal_chunk(self, block_index, seg_index, i_start, i_stop,
             i_start = 0
         if i_stop is None:
             i_stop = bin_dict['num_total_samples']
-        if channel_indexes is None:
+        if channel_indexes is None or isinstance(channel_indexes, slice):
             channel_indexes = [i for i in range(bin_dict['num_channels'])]
 
         num_samples = (i_stop - i_start)

neo/rawio/biocamrawio.py

@@ -114,7 +114,7 @@ def _get_analogsignal_chunk(self, block_index, seg_index, i_start, i_stop,
             i_stop = self._num_frames
 
         data = self._read_function(self._filehandle, i_start, i_stop, self._num_channels)
-        return np.squeeze(data[:, channel_indexes])
+        return data[:, channel_indexes]
 
 
 def open_biocam_file_header(filename):