Action not to perform if the build should be skipped

Apparently, if the build should be skipped, the recipe won't be retrieved, but there's no check here:

https://gitlab.idiap.ch/bob/bob.devtools/blob/master/bob/devtools/scripts/build.py#L142

Yielding the following error

Traceback (most recent call last):
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/bin/bdt", line 11, in <module>
    sys.exit(main())
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/lib/python3.7/site-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/lib/python3.7/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/lib/python3.7/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/lib/python3.7/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/lib/python3.7/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/lib/python3.7/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/lib/python3.7/site-packages/bob/devtools/scripts/bdt.py", line 42, in _decorator
    value = view_func(*args, **kwargs)
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/lib/python3.7/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/lib/python3.7/site-packages/bob/devtools/scripts/ci.py", line 404, in build
    ci=True,
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/lib/python3.7/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/lib/python3.7/site-packages/bob/devtools/scripts/bdt.py", line 42, in _decorator
    value = view_func(*args, **kwargs)
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/lib/python3.7/site-packages/bob/devtools/scripts/build.py", line 142, in build
    rendered_recipe = get_parsed_recipe(metadata)
  File "/Users/gitlab/builds/b6d3167a/0/bob/bob.learn.pytorch/miniconda/lib/python3.7/site-packages/bob/devtools/build.py", line 174, in get_parsed_recipe
    output = conda_build.api.output_yaml(metadata[0][0])
IndexError: list index out of range

Thanks !