osm-garmin: fix misfiring error

osm-garmin/app/build-gmap.sh

@@ -117,10 +117,6 @@ mkdir -p "$maps_dir"
 mkdir -p "$out_dir"
 mkdir -p "$tiles_dir"
 
-if [[ -z $region ]]; then
-    die "No region specified"
-fi
-
 regions_array="$(echo $regions | tr ";" "\n")"
 
 for region in $regions_array; do