Rework refresh_vgrid_map in order to address a potential race and missing field init#380

jonasbardino merged 2 commits intonextucphhpc/migrid-sync:nextfrom

fix/corner-case-missing-init-of-vgrid-map-vgrid-fieldsucphhpc/migrid-sync:fix/corner-case-missing-init-of-vgrid-map-vgrid-fieldsCopy head branch name to clipboard