Marrmot get_value_as_xarray function only works on flux_out_Q

Marrmot returns many variables as
('P',  'T',  'Ep',  'S(t)',  'par',  'sol_resnorm_tolerance',  'sol_resnorm_maxiter',  'flux_out_Q',  'flux_out_Ea',  'wb')

After `model.update()`, some variables like  'P' and 'T' are time series whereas others are one value. Therefore, the `get_value_as_xarray` function returns error as: `cannot reshape array of size 1461 into shape (1,1)`.