bugs when run PegasusData_LittleEndian

The data above has only waveform of pegasus.

If all waveform and soh channels were selected, got the following errors

Traceback (most recent call last):
  File "/Users/ldam/Documents/GIT/sohview/sohstationviewer1/sohstationviewer/view/plotting/gps_plot/extract_gps_data.py", line 451, in gps_data_mseed
    gps_data = extract_gps_data_q330(data_obj)
  File "/Users/ldam/Documents/GIT/sohview/sohstationviewer1/sohstationviewer/view/plotting/gps_plot/extract_gps_data.py", line 28, in extract_gps_data_q330
    operator.iconcat, data_obj.log_data[station]['LOG'], ''
KeyError: 'LOG'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/ldam/Documents/GIT/sohview/sohstationviewer1/sohstationviewer/view/main_window.py", line 765, in data_loaded
    self.gps_dialog.gps_points = extract_gps_data(data_obj)
  File "/Users/ldam/anaconda3/envs/sohpyside6/lib/python3.9/functools.py", line 888, in wrapper
    return dispatch(args[0].__class__)(*args, **kw)
  File "/Users/ldam/Documents/GIT/sohview/sohstationviewer1/sohstationviewer/view/plotting/gps_plot/extract_gps_data.py", line 454, in gps_data_mseed
    gps_data = extract_gps_data_pegasus_centaur(
  File "/Users/ldam/Documents/GIT/sohview/sohstationviewer1/sohstationviewer/view/plotting/gps_plot/extract_gps_data.py", line 235, in extract_gps_data_pegasus_centaur
    gps_chans = {gps_prefix + 'NS', gps_prefix + 'LA', gps_prefix + 'LO',
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'