fix(zfs): Handle zpool list output (#1)

setup.sh

@@ -87,7 +87,7 @@ function we_have_exactly_one_part () {
 function no_zpool_exists () {
     declare zpool_list
     zpool_list="$(zpool list -H)"
-    [[ "$(wc -l <<<"${zpool_list}")" -eq '0' ]] && return 0
+    [[ "$(wc -l <<<"${zpool_list}")" -le '1' ]] && [[ "$(wc -c <<<"${zpool_list}")" -le '1' ]] && return 0
     return 1
 }
 
@@ -167,6 +167,9 @@ function setup_zpool () {
         create_home_dataset
         export_pool
         import_pool
+    else
+        printf -- '%s\n' 'A zpool already exists, that is unexpected. Cowardly exiting 1 ...'
+        exit 1
     fi
 }