filtering raw data in comparer fails

[otzi5300]

When slicing a comparer in time (either using start/stop or specific time=) for the purpose of calculating statistics over a sub-period, we also try to slice raw_data.

modelskill/src/modelskill/comparison/_comparison.py

Lines 862 to 875 in c50518c

	if (start is not None) or (end is not None):
	# TODO: can this be done without to_index? (simplify)
	d = d.sel(time=d.time.to_index().to_frame().loc[start:end].index) # type: ignore
	# Note: if user asks for a specific time, we also filter raw
	raw_mod_data = {
	k: v.sel(time=slice(start, end)) for k, v in raw_mod_data.items()
	} # type: ignore
	if time is not None:
	d = d.sel(time=time)
	# Note: if user asks for a specific time, we also filter raw
	raw_mod_data = {k: v.sel(time=time) for k, v in raw_mod_data.items()}
	if area is not None:

If model results have been interpolated to the obs, the timesteps in raw data and matched data does not align. This can easily make sel(time=) fail since we have no raw_data on this time step.

Solution:
Try to slice raw_data, otherwhise set None.