Re enable sanity checks for argument parser

[vepadulano]

We used to have some sanity checks for the arguments being passed such as

analysis-grand-challenge/analyses/cms-open-data-ttbar/analysis.py

Lines 58 to 69 in 2f410bf

	if ARGS.scheduling_mode == "dask-ssh":
	if not ARGS.nodes:
	raise ValueError("For SSHCluster deployments, please specify a "
	"string with a comma-separated list of hostnames of nodes that will be used.")
	if ARGS.npartitions is None:
	n_compute_nodes = len(ARGS.nodes.split(",")) - 1
	ARGS.npartitions = ARGS.ncores * n_compute_nodes
	elif ARGS.scheduling_mode == "dask-local":
	if ARGS.npartitions is None:
	ARGS.npartitions = ARGS.ncores

I believe we should reinstate these checks and possibly add even more