Grid system detection with `ouranos mrcc5-cmip6`

[kasra-keshavarz]

datatool/var/repos/builtin/recipes/ouranos-mrcc5-cmip6/mrcc5-cmip6.sh

Lines 199 to 200 in 1d1132a

	# choose a sample file as all files share the same grid
	domainFile=$(find ${datasetDir} -type f -name "*.nc" | head -n 1)

This needs to be based on the entries of the user, not necessarily the dataset directory. If fails, most probably file is corrupted, so can be thrown at the user.

Reported-by: Mohamed Elshamy mohamed.elshamy@usask.ca @mee067