Hotfix/allow zero fnamses args

UCL / pyCascadia

Implementation of GEBCO cookbook remove-restore and other cleaning of topography/bathymetry. Uses `pyGMT`.

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Hotfix/allow zero fnamses args #62

Closed JamieJQuinn closed 3 years ago

JamieJQuinn commented 3 years ago

gollum gollum

more than one filenamses not required on command line now that remove-restore can take a file containing filenames. This PR allows zero filenames to be given on the command line. Ensuring there is more than one filename is left to an assertion.