lazily check if onion or i2p sites exist in instances.json before running jq.

generate-instances-json.sh

@@ -728,8 +728,12 @@ main ()
         # (a mapfile would not ideal here since a pipe is required, inducing a
         # subshell, meaning nothing will actually get added to
         # imported_nonwww)
+        if grep -q ".onion" "${import_nonwww_from_file}"  || grep -q ".i2p" "${import_nonwww_from_file}" ; then
           IFS=$'\n' imported_nonwww=($(jq -Mcer '.instances[] | select(.onion or .i2p)' "${import_nonwww_from_file}"))
           rc=$?
+        else
+          rc=0
+        fi
 
           if [[ ${rc} -ne 0 ]]
           then