raster2pgsql option to create or append

[andrewharvey]

raster2pgsql has an option

-d to drop a table if exist -a append raster into the current table -c create a new table and populate it

But is lacking an option to create a new table if none already exists, and append to the table if exists.

Invoking append on a non-existing table raises an error, and invoking -c on an existing table invokes an error.