Unmask dates if nc from cmems had masked array
New version of copernicusmarine (1.2.1) possibly causes dates from nc files to be masked (numpy.ma.core.MaskedArray). Added lines unmask them.
New version of copernicusmarine (1.2.1) possibly causes dates from nc files to be masked (numpy.ma.core.MaskedArray). Added lines unmask them.