free_params option in lightcurve config does not work as expected?

[aaguasca]

Describe the bug
It seems that when computing the lightcurve, the "norm" and "shape" of the source of interest will always be free (for niter == 0) if the source has a ts > shape_ts_threshold even if the option free_params is specified, for example, with only one parameter of the shape.

Expected behavior
I would expect inside the conditional something like:

        if niter == 0:
            gta.free_sources_by_name(free_sources_norm, pars='norm')
            gta.free_sources_by_name(free_sources_shape, pars='shape')
            if free_params:
                gta.free_source(name, False)
                gta.free_source(name, True, pars='norm')
                gta.free_source(name, True, pars=free_params)

Also, I would add in the description of the option free_paramssomething like "if the TS of the source is above shape_ts_threshold"

Additional context
The option free_params in lightcurve is meant to set the parameters of the source of interest that will be re-fit in each time bin. If this list is empty then all parameters will be freed.