Draft: Tcv get ids summary mask fix

The issue is with the summary ids

shot_numbers=67455;
ii=1;
idss_summary = gdat(shot_numbers(ii),'ids','source','summary');

Specifically, when loading the 'tau_energy', all the data is nans. This causes the data mask to be zeros: tcv_get_ids_summary, line 254

mask = ~isnan(global_quantities.(global_quantities_fieldnames{i}).data);

This means that the following data array is empty while the time array has 72 elements:

global_quantities.(global_quantities_fieldnames{i}).data(mask)

Related redmine issue