DROP TYPE without error?

Hi,

Since it is not possible to use CREATE OR REPLACE TYPE, is there a way
of using DROP TYPE on a non-existing type, without causing the entire
script to abort? It may sound crazy to ask for this, but it could be
really useful in my case, where Pl/Pgsql and Pl/Perl code is being
generated automatically, based on data found in a database.

Thanks

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Philippe Lang