Set same error_bars as LIUQE weights for eqreconstruct IDSs

Modifications during WPCD working session on equilibrium reconstruction in Lisbon Jan.2020.

Open for discussion with @osauter @carpanes @ffelici.

matlab/TCV_IMAS/tcv_get_ids_magnetics.m

@@ -18,7 +18,10 @@ end
 [ids_magnetics.flux_loop,ids_magnetics_description.flux_loop]= tcv_ids_flux_loop(params_magnetics.shot, ids_magnetics.flux_loop(1),gdat_params);
 [ids_magnetics.method,ids_magnetics_description.method]= tcv_ids_ip(params_magnetics.shot, ids_magnetics.method(1),gdat_params);
 
-% make arrays not filled in empty: not the case for magnetics
+% make arrays not filled in empty
+ids_magnetics.b_field_pol_probe = {};
+ids_magnetics.b_field_tor_probe = {};
+ids_magnetics.rogowski_coil = {};
 
 % cocos automatic transform
 if exist('ids_generic_cocos_nodes_transformation_symbolic','file')