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cdsutils --help raises ValueError if pygobject installed but not gst-python

The command cdsutils --help raises a ValueError when pygobject is installed (meaning you can import gi) but gst-python isn't:

$ conda create -n test -y -q python=3.9 cdsutils=1.4.2 pygobject
Collecting package metadata (current_repodata.json): ...working... done
Solving environment: ...working... done
... etc ...
$ conda activate test
$ cdsutils --help
usage: cdsutils <cmd> <args>

Advanced LIGO Control Room Utilites

Available commands:

  read         read EPICS channel value
  write        write EPICS channel value
  switch       read/switch buttons in filter module
  sfm          decode/encode filter module switch values
  step         step EPICS channels over specified range
  servo        servo EPICS channel with simple integrator (pole at zero)
  trigservo    servo EPICS channel with trigger
  avg          average one or more NDS channels
Traceback (most recent call last):
  File "/home/duncan/opt/miniconda3/envs/test/bin/cdsutils", line 10, in <module>
    sys.exit(main())
  File "/home/duncan/opt/miniconda3/envs/test/lib/python3.9/site-packages/cdsutils/__main__.py", line 40, in main
    usage()
  File "/home/duncan/opt/miniconda3/envs/test/lib/python3.9/site-packages/cdsutils/__main__.py", line 23, in usage
    mod = importlib.import_module('.'+cmd, package='cdsutils')
  File "/home/duncan/opt/miniconda3/envs/test/lib/python3.9/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 790, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "/home/duncan/opt/miniconda3/envs/test/lib/python3.9/site-packages/cdsutils/audio.py", line 8, in <module>
    gi.require_version('Gst', '1.0')
  File "/home/duncan/opt/miniconda3/envs/test/lib/python3.9/site-packages/gi/__init__.py", line 126, in require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace Gst not available
$ conda install -y -q gst-python
Collecting package metadata (current_repodata.json): ...working... done
Solving environment: ...working... done

## Package Plan ##

  environment location: /home/duncan/opt/miniconda3/envs/test

  added / updated specs:
    - gst-python


The following NEW packages will be INSTALLED:

  gst-plugins-base   conda-forge/linux-64::gst-plugins-base-1.18.3-h04508c2_0
  gst-python         conda-forge/linux-64::gst-python-1.18.3-py39hc345959_0
  gstreamer          conda-forge/linux-64::gstreamer-1.18.3-h3560a44_0


Preparing transaction: ...working... done
Verifying transaction: ...working... done
Executing transaction: ...working... done
$ cdsutils --help
usage: cdsutils <cmd> <args>

Advanced LIGO Control Room Utilites

Available commands:

  read         read EPICS channel value
  write        write EPICS channel value
  switch       read/switch buttons in filter module
  sfm          decode/encode filter module switch values
  step         step EPICS channels over specified range
  servo        servo EPICS channel with simple integrator (pole at zero)
  trigservo    servo EPICS channel with trigger
  avg          average one or more NDS channels
/home/duncan/opt/miniconda3/envs/test/lib/python3.9/site-packages/cdsutils/audio.py:10: PyGIDeprecationWarning: Since version 3.11, calling threads_init is no longer needed. See: https://wiki.gnome.org/PyGObject/Threading
  GObject.threads_init()
  audio        play NDS channel as audio stream
  water        NOT SUPPORTED: No module named 'sip'

  version      print version info and exit
  help         this help

Add '-h' after individual commands for command help.

I don't know if this is just a weird situation that is 'user error', but maybe worth patching just in case.