Changed set_watershed_boundary_condition to permit call of set_open_nodes_disconnected_from_watershed_to_closed from within it. Added improved error handling.
Changed set_watershed_boundary_condition to permit call of set_open_nodes_disconnected_from_watershed_to_closed from within it. Added improved error handling.

RondaStrauch/landlab,Carralex/landlab,RondaStrauch/landlab,cmshobe/landlab,ManuSchmi88/landlab,cmshobe/landlab,csherwood-usgs/landlab,landlab/landlab,ManuSchmi88/landlab,csherwood-usgs/landlab,landlab/landlab,laijingtao/landlab,Carralex/landlab,RondaStrauch/landlab,amandersillinois/landlab,amandersillinois/landlab,cmshobe/landlab,ManuSchmi88/landlab,landlab/landlab,laijingtao/landlab,Carralex/landlab